Someone picked up the game on neogaf, the guy didn't play it but read the manual and here is what he found:
- You can send challenges or replays to Wii Friends
- You can send stars (that you apparently collect?) attached to a replay (freebie) or a challenge (must complete challenge to win stars)
- Online (anyone or w/ friends) you can play Excite Race or Poker Race
- Lobbies for friends, you can see your friends' status, can change bot in the lobby
- Spectator mode for races in progress
- You can bet your stars on races
- Does not appear there is a two-at-once mode online
- Separate minigames mode (?) with 10 games
- Glider mode is indeed triggered by launching off a ramp in leg form
- "Song rail" has you keeping your balance then launching off the end
- Nintendo, not Monster, is responsible for the music