here) for Mario Kart Wii focuses on Diddy and Donkey Kong. And, as you might have guess from the images above, will take place on the track DK64 Jungle Park. There, you must avoid the bananas that both Donkey and Diddy Kong drop from atop their motorcycles. Sadly, there isn't any other info, so we assume you can use any control method you'd like for this one.
The tournament starts today and ends on the 10th. Good luck!
Update: Courtesy of WiiFolder, a video has been embedded past the break, to give you all a better idea of what to expect.