I used to be a firm believer in Wii exclusivity, based on the Wii's rapidly expanding install base and Disney's liking for Nintendo.
Then I began to realize that the Wii's install base isn't translating into much higher software sales per title. Looking at major multiplatform releases, we see hardcore titles like the Force Unleashed and Madden selling much better on the ps3 (let alone the 360) than the Wii, and we see titles on the more casual side of things, like the Lego series, selling better on Wii than ps3, but coming nowhere close to the ps3 and 360 versions combined.
This, combined with SE's love for cinematic gaming, and combined with SE's seeming reluctance to seriously support the Wii at all, makes me believe the game will wind up on the ps3 and 360. Possibly timed exclusive for ps3 in Japan (or fully exclusive, like FFXIII).
I don't think they'll be doing MS any favors from this point on, because with KH3 they won't be able to blame it on dev kits like SO4, or on UE3 trouble like the Last Remnant. They'll basically have to say MS paid them outright, something I don't think they'll be keen to do.
