S.T.A.G.E. on 31 March 2011
There will be no Xbox 360 exclusive character. Ed Boon already spoke about it in the vid docs that the second he saw Kratos in GOW3 he saw a potential MK character and contacted Sony about it. The only Xbox 360 character even partially worthy of being in a Mortal Kombat game is Marcus Fenix and that is pushing it because his moveset would suck outside of the chainsaw bayonette.
