Mario Kart Wii supports eight-player Battle Mode, wheel is rubbish
So says this. The game - releasing on April 11 in Europe - supports 12 players in straight races but eight in the famed Battle Mode. A reason to be cheerful, nonetheless.
Unfortunately, word is spreading from playtests that the Wii Wheel designed for use with the game is essentially rubbish. You can still play it with the Classic pad or even a GameCube controller though, so never fret.