As I see it, here is a number of games that benefit from the WiiU video controller:
* Card games or other games with hidden information, you want to hide from other players, assuming that the WiiU allows more than one of these. Play selection screens in American football would be ideal on the Wii U. Poker night with a WiiU would be interesting.
* RTS and other strategy games. Being able to drawn and point on the screen makes RTS finally have a shot of being doable on a console in a good way.
* The stuff that Nintendo showed. Seeing the golf ball on the ground, is really cool. The sniper option is also cool.
* Games with level editing. Using the touch screen is very helpful for editing, more so than a Wii-like pointer device.
* Boardgames. Having the WiiU controller as your main way to interact is very helpful. Touch to the screen rather than play on the big screen is more natural.
* Driving games. The screen on the controller can act as the dashboard, and also include a rearview mirror.
* FPS and other action games. Declutter the HUD on the screen. Also have the inventory immediately available.
* In a FPS, one player could play commander with the touch screen and order other players around to take over command points on the map.
* Wariorware, as someone mentioned.
And this just scratches the surface of what can be done.
Edit: Another one is games where there is needs for the controller layout to change based on context in the game.
