Nintendo apparently has a lot more content in the works for Wii U than they revealed at the press conference. Game & Wario (working title) is a spiritual successor to the WarioWare series, and uses only the Wii U GamePad controller.
There will be a number of mini-games included in the compilation. The first ones announced include "Arrow" which turns the GamePad into a bow shaped like Wario's mustache. Players hold the GamePad vertically to aim at enemies on the TV screen.
"Ski" has players tilting their system to make it to the finish line. "Shutter" turns your GamePad into a camera, and has players taking pictures of criminals before time runs out. Finally, "Fruit" is a multiplayer game, where GamePads try to quietly steal fruit scattered around the town. "Once the thief completes the mission, the player passes the GamePad to the other players, who then must try to finger the suspect," Nintendo explained.