When we contact Microsoft directly about whether or not Final Fantasy XIII will be getting an Asian version, Microsoft issued this statement: "There’s really no more to say than that as announced at E3, "Final Fantasy XIII" on Xbox 360 is scheduled for release in North America and Europe. There are no plans to release the game in any other region, including Asia."
Do keep in mind that after the E3 press conference, we approached Xbox Japan boss Takashi Sensui about the chances of FFXIII getting a Japan release. His response? Ask Square Enix.