Rockstar made a GTA game even for the underpowered DS, so why sould they not develope for the WiiU!? Moreover, they could simply use the PS360 version and port it to the U.
i think if there making a gta game for the wii u they will use the controller in a lot of amazing ways. the wii u is just a glorified ds with one screen and seen that rockstar made good use of the ds gives me hope for it.