1up Mario Kart Wii Hands-on

Click here for the hands-on

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IGN Hands-on

-Classic controller, GC controller, nunchuck+Wiimote.
-Each character has six vehicles from the start (3 karts and 3 bikes).
-Snaking is harder.
-New Items: POW box and a cloud.
-Warning sound in the speaker for when you are about to be attacked
-Second player can play online through split-screen.
-Mario Kart Channel is in game only, but that can change.
-Tons of statistics for every profile.

IGNs Article here