Still listed here: http://www.gamingtarget.com/article.php?artid=6876 as an XBox360 exclusive (the Japanese name is now Eternal Sonata). Do you have evidence of this?
Oh on gametrailers it was stated like this: Platforms: X360/PS3.
When I search for it now it is stated like this: Platforms X360.
Sorry my bet ^^''
In fact I am not up to date about this game I only downloaded the trailer last week and it was stated like that it was