I think the Wii will get a lot of exclusives, or if a game it multiplatfor the Wii version will wind up being so different that it might as well be exclusive (Rayman).
Wii has the dev cost and market share to get the 3rd parties on board. Also while it is easier to make a game for PS3 and 360 it is not as easy to make it for the Wii since the Wii plays so differently.
I definitely see a KH game coming for the Wii. If the Wii gets DQ and FF as well, they loock in their domination of Japan.