Don't have a Wii U, but it would've been nice to see a third-party hit for the system. Perhaps to put a few bumps in the ECG machine. The Wonderful 101 looked like it was going to deliver, then stumbled rather miserably out of the gate.
In terms of games that I actually played? Would've been nice if the Australian servers of ToR were populated enough that EA didn't decide to kill them off. Then again, it would have been nice if the game wasn't a WoW clone with a Star Wars skin and voice acting.
Oh, and anything on the Vita. For roughly the same reasons as the Wii U, but also because I own one.