It now officially confirmed that Final Fantasy XIII will be releasing on Xbox 360 in Japan. According to the details (Leaked) from Famitsu the game is set to release at the end of this year December 16.
Xbox 360 version of the game will be called "Final Fantasy XIII Ultimate Hits International" and will be available for a price of ¥4,980 (around $60). More details about the game is expected to reveal today as Microsoft holds pre Tokyo Game Show press conference in Central Tokyo.
So Stay tunned for more on it.