Ars Technica notes, from Nintendo's Fall conference earlier this week, the news that Mario Kart for the Wii is slated for Spring of next year. The game is said to involve bikes for the first time:
"It is unclear whether the bikes will be mostly an aesthetic effect or if the control mechanics will differ between karts and bikes. Mario Kart: Double Dash featured a collection of different carts with different statistics, but control was more or less the same across the board ... Despite accusations that Nintendo had nothing to offer the hardcore gamer in terms of announcements at the show, the latest incarnation of the classic kart-racing series was looking sharp in its debut."