This is Skyrim we're talking about. Do you think the great http://uesp.net/wiki/Arena:Labyrinthian from Arena will make a return? It would be quite shameful if Bethesda forgot to include one of the greatest manmade structures in Tamriel in the game: not only that, but it'd be a great way to help connect the locations of the games together. After all, Red Mountain and the Imperial Dungeons were revisited after Arena in Morrowind and Oblivion, respectively.