I'll start off by saying to most people (If I'm wrong about all of this, yes I am a fool who may be taking this too deeply) it won't be random dragons, and it won't be a random story Bethesda is creating here. None of it is random. They know what they're doing with the series. (As I suspect, being Elder Scrolls has proved extremely enjoyable and very deep if looked into thus far) The reason I say this is a small amount of people who I've met over the internet and real life just believe the Elder Scrolls is just an RPG that has a story but they just see it as a game made solely for just being free. While this is true, it's deeper. The plot, and story is extremely deep. (From what I've gathered. Again, I could be completely off the mark, this is just speculations and theories that I, and a few friends share.)
I'll start by saying--I believe Akavir will be an extremely key part in the Elder Scrolls series to come. The Imperial Dragon Insignia the Empire has? They got the idea from the Akaviri. Remember the Disaster at Ionith? How the Akaviri have attacked Tamriel before way back when? They said they would return, when the Empire is fallen, and the royal line dead. It's funny how after Oblivion the last Septim died, and it's obvious how the Empire would turn out after that. Morrowind is in complete disarray with Vivec's disappearance. The Empire is broken, Emperor Mede (Mentioned in the Infernal City) can't hope to keep it together. And the Dragons? The Dragon Insignia the Imperials took from Akavir, was Akaviri. Dragons are on Akavir as well. So, it's VERY ironic, and not surprising that dragons are invading. I do believe these dragons are a part of Akavir, which is why I conclude Akavir is a crucial perhaps 'hidden' plot point in Skyrim possibly.
Next, I'd like to go to someone you know very well; Akatosh. Remember Akatosh? Dragon God of Time, the dude who totally rocked Mehrunes Dagon's socks off at the end of Oblivion? Now I'd like to also introduce someone many people may not know much about, Lorkhan the Lunar God. Also called 'The Missing God'. It's already been released that Akatosh and Lorkhan are one and the same. What does this mean exactly? It means it's a major plot point, however I'll get to Lorkhan a bit later. Skipping through a few things, I'd like to go to Vivec. Vivec also called 'Vehk' in the Love Letter of the 5th Era, that Vivec wrote. Vivec, he was very enigmatic and still is. Indeed, I do believe Vivec's role is extremely larger than just being some false Dunmer God who plotted against Lord Nerevar. He's in league with Lorkhan. Lorkhan had already dealt with the Nine Divines long during the beginning stages, Akatosh himself ripped Lorkhan's heart out. Which is why it's interesting that Akatosh and Lorkhan are the same person. I believe Lorkhan is systematically sealing away Daedric Princes. He wants himself to be the one to be worshipped, or is possibly the overall Antagonist of the entire series. 'The Trial of Vivec' which was a forum RP, I believe on one of Bethesda's forums was called Canonic I believe. At the end of this, it's interesting to note Vivec lunges a spear through Azura's mouth, and Azura is put back into her realm of Oblivion known as Moonshadow. She is sealed within. Now onto Oblivion, what do we do at the end? Akatosh seals Mehrunes Dagon. Being Akatosh and Lorkhan are the same person, and Vivec no doubt working for Lorkhan... It looks like Lorkhan's declaring war on the Daedric Princes wouldn't it? Lorkhan always said he liked Imperials more... Which is why the Septims may have been plotting with Vivec, this entire time. Uriel septim's famous quote, "Find him, and close shut the jaws, of Oblivion.." It could be meaningless to what I'm about to state, or it could be an actual point. Dagon's realm of Oblivion was known as the Deadlands, not Oblivion itself. So the fact that Uriel said "Close shut the jaws of Oblivion" Would mean EVERY realm of Oblivion every Daedric Princes realm. Which is why it's interesting to note Uriel and his son Martin may have been working with Lorkhan. Remember, Uriel was tossed away in another realm while Jagar Tharn ruled in his absence. Who knows what forces spoke to him. Also, funny fact. You know what Chapel Martin was a priest at? A chapel of Akatosh in Kvatch. Coincidence? Possibly, or I could just be a raving Elder Scrolls fan with nothing better to do than try to figure out the overall plot.
This is why perhaps, Akavir as well as Lorkhan may be major plot points in the times to come. I'd love to hear your input. (On how either mad I am, or if you have something else to add)
Interesting enough that Vivec left as well. The ministry of truth fell right as he left Morrowind too. He knew it would happen, so why did he do it? No he was not kidnapped by Daedra, he's working for Lorkhan! Gah, a point I forgot to mention above... Remember good 'ol Morrowind? How you kill the heart of Lorkhan? Ho, ho.. we didn't actually kill it or the false gods power would've waned quicker. No, we merely moved it. Once the heart was moved, Lorkhan was physically able to manifest himself again. And now that we all know Lorkhan and Akatosh are the same person, we see this CLEARLY at the end of Oblivion! Akatosh comes to push Dagon back into Oblivion, and seal him in his realm of the Deadlands! This may be all coincidence, but I believe it may be more than that. The heart was moved. Would we really expect to destroy the heart of a god permanently or even at all? The heart was there for several millenia, and it was moved. Lorkhan regained his heart, and then the war against the Daedric Princes started, attempting to seal them all up.
Now this last part is one of my theories I do not give any credibility to, and it's all pure speculation. Mehrunes Dagon possibly knew of what Lorkhan was planning, and merely used the Mythic Dawn to bring himself and his followers to Tamriel to attempt and stop an upcoming Akaviri invasion, and Lorkhan's return. Ha, how crazy does that sound? Quite crazy actually so don't quote me on that speculation. Just a cool tidbit I thought I'd add in.
Hm, decided to edit this and add one more thing. I believe in Skyrim you're like the Nerevarine in Morrowind. I believe the Dovakhiin is the incarnate of Tiber Septim. Possibly a stretch but this is also interesting to guess. Tiber Septim reincarnated, the Dragon Born. Being, the blades did greet Martin as, "Hail the Dragon Born! Hail Martin Septim! Hail!" Tiber Septim, (Talos') return.
Well, thanks for listening to me just spew out my thoughts on The Elder Scroll's possible ideas, and future plot.