Already have. It also pretty soundly puts to rest the thought that Alduin is Akatosh. I guess I was right. Alduin is some crazy non-akatosh that was pwned by two dragonborn (at least) and possibly a greybeard, who knows, they may have all bee dragonborn.

It's pretty much confirmed that Alduin is Akatosh.

Devastation
Thousands of years ago, lost in the uncounted centuries that came before recorded history, the dragons ravaged the countryside, waging war against humankind and driving them before their might. The humans could not stand against such a force. Some of these humans would come to worship the dragons, but all feared them. For the first of three times, we see depicted Alduin, the World Eater. This awesome and terrifying creature will one day return to devour Tamriel. That day has come.

Alduin’s Defeat
This cryptic image tells of Alduin’s fall to humanity’s ingenuity and bravery, but more than that is not known. This piece of the puzzle would be incredibly important to understand for someone new who might hope to defeat the dragons once again. Who are the individuals standing against Alduin? How did they expel the dreaded beast from the world? Perhaps the re-emergent Dragonborn will uncover the answers.

The Staff of Chaos
The prophecy of Alduin’s Wall depicts several events that would preface the return of Alduin after his expulsion from the world. The first is the shattering of the Staff of Chaos, an event depicted in The Elder Scrolls: Arena. The Staff was an incredibly powerful relic that could open gateways to other worlds and obliterate living beings. Imperial Battlemage Jagar Tharn used the Staff of Chaos to imprison Emperor Uriel Septim VII within the realm of Oblivion, after which he broke the staff into pieces to assure the artifact could never be used against him. Arena’s hero reassembled those pieces and defeated Jagar Tharn.

Numidium
The return of Numidium is another part of the prophecy heralding the return of Alduin. The massive brass golem called Numidium was reassembled during the events of The Elder Scrolls II: Daggerfall. The branching choices that determined who would control Numidium resulted in the Warp in the West, a strange occurrence that paradoxically allowed all choices to happen simultaneously, dramatically altering the world.

The Red Mountain
The mountain once known as Vvaardenfell served a central role in the events of The Elder Scrolls III: Morrowind. In that installment, the villain Dagoth Ur maintained his stronghold within, until the hero of that game infiltrated the Red Mountain and destroyed him.


The Oblivion Gates
The death of Emperor Uriel Septim VII at the beginning of The Elder Scrolls IV: Oblivion allowed the Alduin’s return. A previously unknown heir named Martin Septim, along with the help of Oblivion’s hero, were able to shut the gates once again, but Martin was lost in the process. The end of the Septim dynasty of emperors also brought the end of Tamriel’s third era.


The Sons of Skyrim
With the Fourth Era begun, the sons of Skyrim “spill their own blood”, as described by the Blade named Esbern within the recent trailer. This final terrible event heralds Alduin’s ultimate arrival. As The Elder Scrolls V: Skyrim begins, the high king of Skyrim has been murdered. Many within the northern country wish to secede from the crumbling empire, which has been on the decline for 200 years since the fall of the Septim Dynasty. Other Skyrim citizens insist the Empire is still worth fighting for. Conflict between the two sides seems inevitable.

Hope
The prophecy depicted on Alduin’s Wall is dire, but it is not without hope. A single individual, gifted with the same incredible powers held by the dragons themselves, may rise to fight against Alduin and assure the world’s survival. The Akaviri armor worn by the Blades in this image originates from another continent beyond Tamriel. The Blades shown in the image bow before the Dragonborn. They’ve protected the line of the Dragonborn for generations in anticipation of this moment, when a Dragonborn would rise to face Alduin upon his return. 200 years ago, with the closing of the Oblivion gates, the line of Dragonborn heirs was lost with the last of the Septims. As Skyrim begins, a lone prisoner begins to learn that he may hold a similar power…


The Throat of the World
A great mountain rises above the tundra and forests of Skyrim. The Throat of the World houses High Hrothgar, the home of the Greybeards, who will play a key part in the Dragonborn’s story. 7,000 steps must be climbed to reach the remote retreat. Here on Alduin’s Wall, we see the mountain cleft in two, symbolizes the way Skyrim is tearing itself apart as the game begins.

I really want to know how it's confirmed that Alduin is Akatosh.

I really want to know how it's confirmed that Alduin is Akatosh. Akatosh can't physically interact with the world and then we have the new information that there was a dragon that was banished from the world because it was on a rampage of destruction. That even strengthens my conviction that Alduin is not Akatosh. The only thing the theory of Alduin is Akatosh runs on is that people believe that Alduin is the Nord name for Akatosh. It's not like the peoples of an ancient civilization have ever misinterpreted anything before... The biggest evidence that it can't be Akatosh is an Aedra, whom can't interact with the world physically. If anything it could be Peryite who slipped into Nirn while the barrier was at it's weakest, which would make more since because it said what allowed for Alduin's return was the Oblivion Crisis.

I don't know enough about the lore to be able to say whether Akatosh is Alduin...but I find that far more interesting than just Alduin being some old ornery dragon. Go to the lore forum and read about the theory about Akatosh helping Martin in Oblivion to set the stage for his role in Skyrim as Alduin. I'm just saying...I'd rather go with established lore than some stupid gaming media article written by someone who probably doesn't even know who Akatosh is. And it's not like Bethesda is going to bang you over the head with "ALDUIN IS AKATOSH"...I expect it to be subtle and provide something of a plot twist (See: Shivering Isles).

Alduin eats the world in order to make way for the next kalpa, this is a neccesary and fundamental part of Nirn, though not something many people who live there will enjoy.
Mehrunes Dagon is a destroyer because in previous kalpa's he hid things from being eaten by Alduin, only to put em back the next kalpa, at hidden places. So it would take longer each time for Alduin to eat the world, and he would have a longer existence.
The plan backfired and now he is cursed to try and reduce the size of the kalpa so Alduin can eat it fully, wich is a lot more interesting than being a mindless destructive force.

The imperial library pretty much confirmes Alduin as Akatosh, at least in my opinion.

I've read the theory of that and it just doesn't fit actual lore. Because Alduin isn't some ornery dragon, he is the World-eater. He can be extremely dangerous and powerful without shattering the very perception of lore and reality by saying "Oh yeah and now you have to fight and kill a dragon god, good luck!" Because it doesn't makes sense for it to be Akatosh. Now Peryite maybe and you have to banish him back to Oblivion or something. Just not Akatosh, because if you kill Akatosh, you unravel time...That would be fun.

I really want to know how it's confirmed that Alduin is Akatosh.
Akatosh can't physically interact with the world and then we have the new information that there was a dragon that was banished from the world because it was on a rampage of destruction. That even strengthens my conviction that Alduin is not Akatosh. The only thing the theory of Alduin is Akatosh runs on is that people believe that Alduin is the Nord name for Akatosh. It's not like the peoples of an ancient civilization have ever misinterpreted anything before... The biggest evidence that it can't be Akatosh is an Aedra, whom can't interact with the world physically. If anything it could be Peryite who slipped into Nirn while the barrier was at it's weakest, which would make more since because it said what allowed for Alduin's return was the Oblivion Crisis.

I really want to know how it's confirmed that Alduin is Akatosh. Akatosh can't physically interact with the world and then we have the new information that there was a dragon that was banished from the world because it was on a rampage of destruction. That even strengthens my conviction that Alduin is not Akatosh. The only thing the theory of Alduin is Akatosh runs on is that people believe that Alduin is the Nord name for Akatosh. It's not like the peoples of an ancient civilization have ever misinterpreted anything before... The biggest evidence that it can't be Akatosh is an Aedra, whom can't interact with the world physically. If anything it could be Peryite who slipped into Nirn while the barrier was at it's weakest, which would make more since because it said what allowed for Alduin's return was the Oblivion Crisis.

I believe it's been mentioned by GameInformer but I'd like to think people are able to understand a bit more then that.

When talking about the Aedra you have to keep in mind that they are rather flexible. They're ideas shaped by the perception people have of these ideas. This is most obvious when taking a book like http://www.imperial-library.info/content/morrowind-varieties-faith-empire or the http://www.imperial-library.info/content/morrowind-monomyth. The same story repeats over and over again, with different costumes, music and plots.

Akatosh, Alkosh and Ruptaga all have similar positions. They're all the chief Deity. Alduin is a bit different, he's closer to the Yokudan Satakal, the serpent that eats the world to make room for the new one.
Further more Akatosh and the other Divines are an http://www.imperial-library.info/content/oblivion-shezarr-and-divines.

Based on this it's tempting to think that the ancient Cyrodiils were ignorant. Though that would over look that Akatosh, Alkosh, Ruptaga and Alduin are all the embodiment of time. Though they embody it in different ways, and that difference is best explained by relation between the Nords and Akatosh compared to the rest of Tamriel.

When the world was created the Aedra felt that Lorkhan had betrayed them, or followers of Lorkhan felt that the others were keeping them out of the good bits of Nirn, or Lorkhan was betrayed by his luitenants, or a few other variations on the theme.
Either way the result was a big war. The Nords (or rather their ancestors) had sided with Lorkhan, going up against the Merish hordes of Auriel. So to the Nords Ariel wasn't this glorious god king, rather he was the god of time and destruction come. Hence he - and thus Akatosh - is much easier to associate with Alduin.

You could say that other cultures have repressed this aspect of Time.

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I forgot to address the lack of interaction. Look up, Ama-Nin and John Hawker.

That is also a nord fairy tale that was obviously a fairy tale by the way it was written. It isn't fact. It may be based on a shred of fact but that isn't actually how it happened. In actual lore, not Kirkbride musings, the world hasn't been eaten by a dragon multiple times, it was created once. The creation of Mundus and Nirn aren't just light things that can easily happen, entire Aedra gave themselves to creating Mundus and Nirn and Akatosh and the other divines gave up much of their powers to create it the first time, it can't just be remade over and over again willy-nilly. The imperial library isn't god and not everything Kirkbride writes is lore, seeing as he hasn't worked at Bethesda since during Morrowind. They hire him to write some lore for them still but not everything he writes is lore. Especially since Mehrunes Dagon couldn't be a leaper demon seeing as how he is a Daedra Prince and wouldn't be so easily defeated by an Aedra. There is no basis in lore that can support that Akatosh is Alduin seeing as how Akatosh can't physically interact with Nirn because of the loss of much of his power.

Akatosh CANNOT PHYSICALLY INTERACT WITH THE WORLD!!!

Aedra can physically interact with the world even more easily than daedra -- ignoring the several times in TES3 and TES4 where you encountered one of the Nine in disguise, Mannimarco was technically a minor aedra after Daggerfall -- that's why his power was associated with a celestial phenomenon (the Necromancer's moon, if you'll recall).

Past lore is pretty clear that Alduin is Akatosh is Auriel. But, lore is also clear that, prior to the events of Shivering Isles, Jyggalag is Sheogorath. A plane can have multiple personas, sort of like a person with dissociative identity disorder (and especially like the Hollywood version). They are the same god, because the plane is the god. But that doesn't mean that Akatosh and Auriel can't be your ally while Alduin is your enemy.

In actual lore, not Kirkbride musings, the world hasn't been eaten by a dragon multiple times, it was created once.

Also I see the same people using this lore to try to believe that the aedra can affect the world also believe that Lorkhan is still alive when he isn't.

You don't truly interact with the nine, they are just avatars, they have no real power. Mannimarco ascended to become a demi-god because of the Mantella, he isn't an Aedra. Also I see the same people using this lore to try to believe that the aedra can affect the world also believe that Lorkhan is still alive when he isn't. I mean, his corpse is floating above Nirn and the Nerevarine destroyed his heart. Just because manifestations of him show up occasionally doesn't mean he is alive, they are echoes of him, sort've like imprints in the world.