Now in Morrowind the Arena location we had access to was important to the story, aka Dagoth Ur. It was rewritten and fully fleshed out in the lore....raising it from just being a meaniless dungeon from the first game. I know there isnt a alot to go on here for speculation, Daggerfall didnt include the Crypt of Hearts, and in Arena the only place in Cyridil was the Imperial City.
So what do people think? Will these two Skyrim places play a part you think? or just be some interesting side quest.