That's what sold me on the idea of more worlds yet to announce as from what Nomura has said we still have 3-4 POH unaccounted for which also adds possibility for Princess and the Frog which is great.
At this point I'd be disappointed if Princess and the Frog didn't make the final cut. Both because of the PoH plotline and the fact that there are less 2D films this time around. And, PatF would provide some amazing environments.