Besides announcing that tablets sold at Gamestop will get the game early, SEGA has revealed that Tails will be playable from the second playthrough onwards in the re-release of Sonic CD: http://blogs.sega.com/2011/11/01/sonic-cd-spins-onto-tablets-at-gamestop/
The game will be released on XBLA, PSN, Steam and Mobile in December
The game will be released on XBLA, PSN, Steam and Mobile in December