Mario Kart 8 is in development for Wii U and one of the new mechanics is driving on the wall. Mario Kart 8 has anti-gravity courses along with underwater driving from Mario Kart 7. Players will be able to drive both karts and motorcycles in the game.
Mario Kart 8 has online multiplayer and will support Miiverse. The game is slated for release in spring 2014