My god, it's been forever since I've logged in.
Anyway, my opinion on this is really quite broad. I'd like it to be on the PS3, for two reasons.
1. PS3 uses blu-ray discs, which have a SIGNIFICANT advantage over HD-DVD's in terms of space, making for a much bigger, better game.
2. Graphics on the Wii just don't compare to the PS3. I'd hate to see them put it on the Wii and just.. spoil, what could've been a beautiful game.
And while the Wii does have a larger user base, you have to remember that the user base is very diverse, and not focused on the age-group that KH is going for. Good or bad, I dunno'.
A lot of you seem to be counting out the idea of a multi-platform release. If anything, I'd love it to be just on PS3, because that way they could really use it to it's full potential. But if it's on 360 and PS3, it will drastically change the game, in my opinion. Although, you also have to consider that the 360's user base is a decent amount larger than the PS3's too, so it could make a bigger profit. It's really difficult to guess what console they're going to choose, especially since it's SE.