Well Bethesda doesn't necessarily have to include The Infernal City as they are not required.
Why would Bethesda release a TES book if it's not canon? Kind of defeats the whole purpose. Plus, The Infernal City is set only 40 years after the events of Oblivion, so it's 100% sure (there's big time gaps between TES games usually) it's taken into consideration.
One interpretation I have come up with for the teaser trailer is that the dragons are returning to Skyrim because of no heir to the throne, and the recent opening and closing of the oblivion gates. It's a possibility since there is no Emperor, that chaos is ensuing as a result. Could Dragon Born be the next heir to the throne of the Empire? Is it a possibility the Champion of Cyrodill will aid Dragon Born in this quest as he aided Martin? Many questions...
No TES game is a direct sequel in terms of the time that it takes place and the characters. Oblivion would be the second to really affect another game, since the Empire gets destabilized by the death of the last Septim. But Skyrim will still by no means be a direct sequel - as Oblivion wasn't one to Morrowind - it has always been about starting with an all new and nobody dude. The opening and closing of the Oblivion gates only affects Skyrim in the way that it killed all Septims. The allusion to the Oblivion gates in the trailer is merely a way to place the game in time, that it is after those events, and that the Empire is quite shaken. Though I'm still not sure why Akhulakan (from Morrowind) is on that carving...
@ Maruhkati - It's true this isn't Bethesda's traditional style to make a direct sequel. It has never a tradition that they have followed. But rumor has it Fallout 4 will also be a direct sequel to Fallout 3. Could Bethesda be trying something new? This wouldn't necessarily be limiting the character, since the Champion of Cyrodill was already a character everyone had freedom to create in Oblivion. I just think it's interesting.
Impossible for Skyrim. Fallout 4 isn't a TES game so it's irrelevant, since they made only one game there's no real way of making Bethesda Fallout games. As for TES, playing the Champion of Cyrodiil would mean start with a powerful character with already a whole backstory. You don't start as a hero in TES games, you become one, that's part of the fun. Plus, we already played as the Champion of Cyrodiil for hundreds of hours, do you need to play as him AGAIN, after 5 years? Please, no one wants that, like no one wanted to play as the Nerevarine in Oblivion, we want something new, something fresh. And Bethesda has told this more than one (last time I know in an interview right before the release of Shivering Isles) that the focus for each TES game is to make it entirely different than the predecessor, and you don't make an entirely different game by making it a direct sequel and using the same character. It's like making a small TES game, it just can't.
Posted by Nordic Warrior earlier:
The rumors in Morrowind suggest that Uriel was going to die of his illness, but instead the writers invented a new death: assassination by the Mythic Dawn.
The rumors in Morrowind suggest that his sons were going to be killed because of the suspicion that they were Tharn's doppelgangers, but instead the writers invented a new death: assassination by the Mythic Dawn.
(Provided by RBNobody)
These two obvious retcons alone show that Bethesda isn't shy of retconning lore to fit the next installment. Could the books be written to specifically address the events between Oblivion and Skyrim? Yes. Is this also an assumption? Yes.
Rumours. You know what that is? Having rumours of Uriel dying of illness does not make the possibility of him being assassinated not true. Plus, Oblivion was first rumoured to take place in the Summerset Isles, these in-game rumours weren't meant as foreshadowing, only adding depth to the universe. There were rumours about trouble at the Summerset Isles in Oblivion, did this meant TES V would take place there? No. Only added depth to the universe.
I'm almost 100% positive that the books address events between Oblivion and Skyrim. First of all, it's a popular thing in video games, a good way to hype people, build more lore and tell how the Empire has been in the meantime. Second, you write a timeline like the TES one by going into the future, you don't write a bit of future and then write a bit of past that may change that future. Dragons invading Tamriel? You bet you'd know that somehow in the Infernal city or the sequel.
Also who says that the events in TES:V Skyrim would need to be in The Infernal City? For all we know, the events of Skyrim could be mentioned in the next book coming out. Maybe they just aren't necessary to mention (The Infernal City is the pressing issue). The author of the books has no connection to TES whatsoever, aside from writing these two books about events taking place after Oblivion. We could assume he knows about TES:V Skyrim, but it's also quite likely he doesn't. All I am stating is just because this isn't mentioned in a novel doesn't mean it has to come after because of it. Skyrim may come after, but it's clear the events in Oblivion are directly affecting the events in Skyrim.
What's the point of releasing a book spoiling the events of an upcoming game? It's only logic that those events will lead up to the political background of Skyrim, not necessarily particularly important events tied to the story.
If Bethesda hired a writer to expand their big TES universe, you'd bet they'd give enough information about it so he can write a decent piece of work that doesn't screw up with anything. If the events in the books are bridgin events, he most likely knows about Skyrim. I'm very positive the events of Oblivion were not that important, the key element is no heir to the throne and the Empire getting in turmoil because of those events. Like the destruction of the heart of Lorkhan made it possible for the Oblivion crisis, Oblivion wasn't a direct sequel of Morrowind for that. Skyrim will feature an entirely different story almost completely disconnected to Oblivion only that the aftershock of the crisis made the dragon invasion possible. We won't return to Oblivion or anything to deal with daedra lords who can't mess up with Nirn anymore.