It's because it's the only worth while game for X1 it happens to all good launch window games. (n4g.com)
You know, besides the 23 it launches with and the couple of dozen other launch window games to come before March. (poisonmushroom.org)
Those of you following the history of Rayman Legends are already aware it is a late Wii U launch window game and not expected in stores until March 2013. (thehdroom.com)