What I hope they do for 2015 is reveal a few areas not not specifically. They could say "a desert, jungle and a new town could possibly appear in the new game". Just some traditional levels to speculate on if "the desert they mean" is Agrabah again, or something new.
You mean that they having started choosing SOME worlds? Rock Titan appeared. That most likely mean Olympus is back. I believe Olympus Coliseum and Agrabah will return, and Pride Lands too.
No, I mean they haven't started choosing ANY worlds yet. They've said so. Rock Titan could have easily a place-holder meant to show of the scale of battles without spoiling anything. It could be some other giant boss we fight in that area.
The only thing we can be sure of right now is Attraction Flow, the Kingdom Shader, and Keyblade Transformation. That's it. Just, don't get your hopes up, chances are the only thing we'll get next year is gameplay and story details.
