Rumor floating about this morning has Sonic 4 hitting retail after all four episodes are released.
This rumor stems from (D'toid, Kombo) fans flicking through the official site content and noticing that after episode four, there is another Sonic 4 with its release date and platform "TBC."
Honestly, if it were to happen it would not be too surprising, but we'll email SEGA and ask. To be fair, it probably won't tell us anything and is instead waiting to announce it at a later date.
Then again, it could just be a web mistake, and meant to have been taken off or replaced once the game was officially announced. Or, it could be the rumored iPhone version.
The first episode lands on PSN, WiiWare and XBLA this summer.