The truth may be that Nintendo simply does not want it and likes doing there own thing. Not only is that what they do best, but it's what makes them Nintendo. While Microsoft and Sony are a mirror of each other of a kind, Nintendo is its own genre and has its own experience. (C'mon none of you can say you don't enjoy SSB.) And if that's not the case, it may be either bungie or activision don't feel the wii u has the potential, or that they may have a release planned and are currently converting the game to work on the wii u. As I said before Nintendo have their own way of doing things so it probably will take longer to convert it to the wii u's system.