Well FFXIII is most likely not going to be a PS3 exclusive but since it's not coming to the Wii (I seriously doubt they would go through the trouble of downgrading the graphics) it will be an exclusive in Japan for all intents and purposes. What wouldn't surprise me is if Square makes 2 chapters, essentially games, the PS3 and a new Wii one. Either that or they scale back the PS3 FFXIII to put resources into a side quest for the Wii. I would be very surprised if Square took the financial hit of releasing a hugely espensive game only on the PS3. The financial reasons not to are simply too great as every other developer is discovering. Squares trade show is coming up and the reportedly have big news about FFXIII and a new game on an unspecified console so we'll see what's going on in May.