Most interesting thread. I'd just like to clarify that GRO is indeed coming to the Wii U (that much I think was clarified) in addition to the PC. Killer Freaks is the new shooter IP for the Wii U.
GRO on the Wii U is a brand new team working on the game in parallel to the PC development, which is already in beta.
What remains unchanged: GRO on the Wii U is an online only multiplayer game, just like PC. The setting, and the events are also in the same time period as the PC version.
What can be changed for the Wii U: We have more than a year to ship, so everything else! Seriously though, the new touch controls give us a whole new interface to play with and the round table conference video linked to in this forum shows only some of the thoughts we have put in that area. It completely changes gameplay and the way we approach interaction with the game world. Wii U has given us a device that we hope to make a physical manifestation of the Cross Com 2.0 in your hands.