I need to see Big Hero 6 now.
Most interesting thing about this reveal is the potential it opens up for worlds, it means more CG movie worlds seem more likely, which in turn makes Pixar more likely. I'm totally fine with this, while it will be sad not to visit some old worlds a final time at the end of the saga CG Disney/Pixar movies really lend well to the new artstyle (and the same type of disney worlds we see in Kingdom Hearts with nothing feeling out of place) in 3 so i'm most welcome to most of the worlds being based off of them.
And the other one is that world being set after the movie, it shows that there's plenty of interesting options for world plots rather than just following the movies with a abridged plot. After the Tangled world reveal and now this i've strongly got the impression that the Disney worlds will feel more original and involved like the original Kingdom Hearts rather than a sideline (even if we do have keyblade war 2.0 and final installment of this saga going on inbetween it all) again this time. So far only Twilight Town and Olympus Colosseum have been confirmed, but there was a world that was shown at a 2.5 launch event that could have been The Land of Departure, chances are we'll end up going there to
Edit: Dunno how I forgot that we've had post-movie plotlines in Kingdom Hearts before. Still I don't think we've got one that starts out from there as a introduction to the world.