Xbox-Exclusive Mortal Kombat Character Nixed for Mysterious Reasons - The Escapist
Amazon.com: Mortal Kombat - Xbox 360 : Video Games
So apparently it was planned to have the Arbiter from Halo series or the general RAAM from gears of war as Xbox 360 exclusive character just like they did with Kratos from
Mortal Kombat 9 Xbox 360 vs PS3 Compared | Attack of the Fanboy