Mario Kart for the Wii is getting a little further away from you: The projected release date was originally the first quarter of 2008. The new date is Spring 2008. So put on your waiting pants.
On the "plus" side of the ledger: Mario Kart for the Wii will feature bikes. Not sure how that will work, or what the bikes will do, but they will be there.
Kotaku.com: 'Mario Kart' Wii Delayed, But Biked