The controller's have a 6.2-inch touchscreen. It also have a d-pad, twin analog sticks, a front-facing camera, four shoulder buttons, accelerometers, vibration motors, and a mic. It's backward compatible with the original Wii and Wii accessories, like Wii Fit.
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Nintendo have announced a release date of between April and December 2012 for the WiiU, which is the first of their games consoles to support HD graphics.
The 6.2-inch colour touch-screen will work like a second display, showing the same image being played on the TV screen.