The latest edition of Famitsu magazine has some fresh new details on Mario Kart Wii. First and foremost, the game is said to release in Japan on April 10th, for around 5800 Yen ($54). North America is also expected to get it sometime during the second quarter.
That's right, your Mii can be incorporated into the game. As shown here in this scan.
As for the courses, this is what you can expect:
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