First introduced in this year's E3, Sonic & Sega All-Star Racing is not an official title in the making. It is being scheduled to be released on 2010. The game is being developed by Xbox 360, Wii, Playstation 3, Nintendo DS, and Microsoft Windows. The game features characters from both the Sonic universe and characters from different Sega installments. It is being published by Sega and developed by Sumo Digital.

According to sources, the game will play out like a kart-racing game; characters can collect power ups and special powers which can affect other players.

Confirmed characters
Sonic the Hedgehog
Miles "Tails" Prowers
Doctor Eggman
Amy Rose
Shadow the Hedgehog
Big the Cat
Aiai from Super Monkey Ball
Amigo from Samba de Amigo

Confirmed stages
Seaside Hill - Sonic the Hedgehog
Blizzard Castle - Billy Hatcher

Link to official website. Includes videos.]