Mario Kart SuperPower Speed

 is a upcoming game in 2013.

Gameplay
This will involve the coins, kart customizing, and bikes. It will also involve a new Double the Coins mode.

Another new mode is Boss Mode where you challenge champions, which are

pretty much the bosses of the game.

Racers
More characters will appear, as some of them are confirmed.
 * Mario
 * Luigi
 * Princess Peach
 * Yoshi
 * Princess Daisy
 * Toad
 * Baby Mario
 * Baby Luigi
 * Shy Guy
 * Lakitu
 * Wario
 * Waluigi
 * Bowser
 * Donkey Kong
 * Wiggler

Third Parties
Go to the Mario Kart Superpower Speed/Third Party Voting Poll for results.

Nitro

 * Mario Circuit
 * A unnamed racetrack that takes set in NSMB2 World 3
 * A unnamed racetrack that takes set in a snowy valley
 * Gloomy Manor
 * Paper Circut

Retro

 * DS Figure-8 Circuit
 * 3DS Music Park
 * GCN Sherbet Land
 * SNES Koopa Beach 1
 * 3DS Wuhu Loop

Kart Customizing Parts
TBA

Trivia

 * It is unknown to have the second party characters.