Kotaku.com writes "It's been confirmed that Final Fantasy XIII will not be released for Xbox 360 in Japan.
That's according to an article in Dengeki PlayStation magazine, as translated by Kotaku.
Game director Motomu Toriyama is quoted as saying, "There will absolutely not be an Xbox 360 version of Final Fantasy XIII for Japan," which is hard to misinterpret."
Updates:
Sorry. The quote and title are from Eurogamer.net. I had to change the URL and forgot to change the text.
Also, it got approved pretty fast so I didn't have a chance to change it, anyway. Sorry about the oversight! :)
