Sega seems to be preparing the second episode of Sonic the Hedgehog 4, if a Korean rating is any indication. The downloadable titles were put on hold this year due to Sonic's anniversary celebrations with Generations, but Sega has previously said Episode 2 is coming in 2012.
Siliconera reports that the Korean rating tends to come a few months before the game releases. Sega may be aiming for a spring release, rather than the fall when Episode 1 launched. Previously the Korean Rating Board has spilled the beans on Limbo for PS3, Joe Danger for XBLA, and the Jak & Daxter Collection.