"popular rival" Metal Sonic as a playable character. There's also an Emoticon Sticker Pack.
Collectibles are strewn throughout races and the Emoticon Sticker Pack adds a few more. They can be earned through "skilful play, high scores and more." It's out late 2012.
The extra goodies are only available through pre-orders of the Bonus Edition. Sonic & All-Stars Racing Transformed releases on Xbox 360, PS3, Vita and PC November 20th.