We have heard rumors and rumblings of a Wii U version of Grand Theft Auto: V being in the works for a while now. Here is some fresh info on the subject coming from Gameindustry:
"We believe releasing GTA V in F4Q instead of F3Q will provide four advantages to TTWO: 1) a less crowded window away from the big holiday releases such as Call of Duty, Assassin's Creed etc. Recall, the previous GTA title (GTA IV) was released on April 29, 2008, i.e., also away from the holiday period; 2) smoother earnings in FY14 especially if GTA V launches in the last month of FY13 (March 2013); in other words it will result in stronger GTA V catalog sales in FY14; 3) a larger installed base including the potential for launch on Nintendo Wii U; and 4) an extra couple of months to polish the game."
While the idea does sound like it would make perfect sense to put this game on the Wii U, if it will actually happen is totally up to Rockstar and if they think there is an audience for it on Nintendo's system. It may depend on the how well core titles sell on Wii U during this holiday season when it's launched.