I am intrigued by the opportunities in adding a Frozen world.
You know, in the movie, Elsa could essentially kill people by freezing their bodies from their hearts ("Hearts" is a key term in the KH universe)? And that actual love is the way to reverse the curse?
What would happen if she did that curse on a KH villain? Maybe Xehanort, etc. is too powerful for the curse to work, though.
Or maybe Elsa goes mad again, like the movie. But those videos seem to disprove this.
But I cannot be sure if worlds like this don't get tossed in the trash heap right before release or not.