The next Mario Kart!

[RCTjunkie]

Keep:
-Old Courses mode
-Bikes
-Single-Racer Mode
-Lots of Characters/Vehicle options
-12 racers (16 is good, too)
-Online
-Motion Controls
-Ranking System for GP's
-Tournaments/Rankings
-Same crazy obstacles and track design (see Koopa Cape, Coconut Mall, Wario's Gold Mine)
Add:
-Item-selection a la Super Smash Brothers series (Get rid of Blue Shells)
-Double-Racer Mode option
-Free-For-All Battle, along with 6 teams of 2, 4 teams of 3, three teams of 4, and 2 teams of 6 possible.
-Actually, add the team type variety to Multiplayer while I'm at it.
-Oh, and LAN.
-Online divided with Kart-Only racers, Bike-Only racers, and both with a choice.
-Multiplayer GP mode where you can actually unlock stuff
-Custom Track Editor

I'll add more later as they come up.