When Square Enix decided to announce that Final Fantasy XIII was going multiplatform in both North America and Europe, it might have been the biggest shock of this console generation. In Japan however, FFXIII remained exclusive to the PlayStation 3. However, that may be changing very soon.
The Japan PS3 exclusivity may be over if THIS page over at Microsoft has any truth behind it. The page clearly displays Japanese version of Xbox 360 achievements for Final Fantasy XIII. For now this is still just a rumor, but the evidence point to Lightning striking twice on PS3 exclusivity.