When will a game use two Wii U Gamepads?

[Signalstar]

We have known about the Wii U since 2011 and Nintendo (correct me if I'm wrong) has yet to show off a game that uses more than one Gamepad despite announcing that two will be supported at last year's E3. Did Nintendo lie? Have they not worked out the functionality properly yet? Or are they just waiting for the right game to show it off?

Everyone was so concerned about this question before Nintendo cleared it up but since then we have heard nothing. I blame the gaming press for not asking the question more often. Asymmetric gameplay is fine and all but you know what is even better? Symmetric gameplay. I think showing off games with more than one gamepad would boost the system's profile. Selling additional controllers probably adds a nice amount of spending to a console's ecosystem and Nintendo is largely missing out on that with the Wii U (aside from the Pro controller).

When will we see two Gamepads playing at the same time? When Super Mario 3D World releases? Mario Kart 8? Super Smash Bros? Ever?