So, according to the Megami Tensei wiki page for Da'at, (found here), Da'at is an alternate world and, based on the gameplay vids we've seen so far, a fair portion of the game takes place there.
However, I have no idea where the wiki page editor actually got that information, and assuming it is legit (which it most likely is based on what Tao says in the Gameplay Trailer), would it be fair to assume it qualifies for the trope Breaking Old Trends? Previous mainline SMT games always featured the protagonists wandering Tokyo after an apocalypse scenario devastated the city in some way. This is the first time the game's conflict takes place in an alternate world, even if said world is also a devastated Tokyo.
Isn't time to create folders with Vengeance-exclusive tropes already? There's a lot of info that came from the trailers and the Special Program Spotlight. Sonic x Shadow had much less info to work with and there's already a folder with tropes pertaining it.