Nintendo has issued a new Mario Kart Wii fact sheet documenting how many tracks are in the game and the previous Mario Kart games they come from, how online works, and how the different control methods work. While we all know the game supports the Wii Remote with or without the steering wheel, the Nunchuck and Wiimote combo as well as the Classic Controller and GameCube controller are all supported modes. However… It is worth noting that the classic modes, ie, the GameCube and Classic controllers have been marked with a disclaimer by Nintendo stating that, players cannot perform certain moves with this control scheme. Perhaps these relate to the motion trick controls, or something else that has yet to be revealed.
Source: GoNintendo