http://ds.ign.com/articles/121/1210424p1.htmlmario kart7 courses and new powerups explained
The Tanooki tail is activated once and can be used continuously for a short period, much like the Golden Mushroom in previous Mario Kart games. It can be used to hit other players, and also to destroy certain obstacles in the game's environments (though it won't work against all of them).
The Fire Flower will allow players to shoot fireballs at other racers. There's a limited number of fireballs to shoot from each flower.
The final item is Lucky Seven, which will provide a player with seven different power-ups. The power ups will spin around the player, much like red shells or green shells, and can be used one at a time.
Two other cups still haven't been revealed,
Mushroom Cup
* Toad Circuit
* Daisy Hills
* Cheep Cheep Lagoon
* Shy Guy Bazaar
Flower Cup
* Wuhu Loop
* Mario Circuit
* Music Circuit
* Rock Rock Mountain
Shell Cup
* Luigi Raceway (N64)
* Bowser Castle I (GBA)
* Mushroom Gorge (Wii)
* Luigi's Mansion (DS)
Banana Cup
* Koopa Beach (N64)
* Mario Circuit 2 (SNES)
* Coconut Mall (Wii)
* Waluigi Pinball (DS)