Board Thread:Mortal Kombat X/@comment-4222221-20140620035906/@comment-1084762-20140814162123

the reason Komplete Edition and Ultimate Edition were released to PC was because all the DLC had already been released prior to their launches (on PC). also why the Vita version only has Komplete edition. though, PC's sales could lead to an exclusive, I don't really see them adding anyone aside from an already existing X1/360 exclusive character (again, that's assuming there'll even be one).

and IIRC, Ed Boon once said that the MK9 DLC sold VERY well and was the reason Injustice's was a lot more fleshed out.