The Wii-mote not only opens doors for endless types of new gameplay, but also a steady stream of Wii-mote peripherals. For example, this quote that comes via Go Nintendo:
Ubisoft's Japan-developed GT Pro Series—which may or may not be a Wii launch title, depending on where you get your information from—will come with an attachment of some sort that will make it a 'must-have'. We're guessing a clip-on steering wheel. Developed by the people behind the GT Advance series, the game will include over 80 licensed vehicles.