Have you not heard of The Last Remnant, a DUAL platform game for the PS3 and 360? I'm willing to bet the game will sell *a lot* on the 360 and PS3.
*Edit: Oops I guess you meant primary series but I can't understand the logic behind that if they're willing to do ports and remakes of games on just about every platform and also have a multi-platform game in development for the PS3 and 360 and have mentioned that the Unreal 3 engine keeps down costs, that it would be so impossible to believe that they'd make other multi-platform titles. I mean if Capcom is now doing it with their Resident Evil franchise and many many other developers are making multi-platform titles with their major series for the PS3 and 360 why not Square? As for them not breaking traditions, I remember people saying they'd never leave Nintendo's platform (that was right up until the big FF7 shocker was dropped on the public).
Why the hell would they use UE3 on a KH game? Don't say"TEG GRAFIX" because the Disney demographic in the game doesn't cut it when using UE3. Disney is cartoons not HD.