Sonic the Hedgehog 4 will be expanding on May 15 (PSN) and 16 (Live) with Episode II and a new unlockable story, Episode Metal. The new episode will be 1200 MS Points/$14.99, and for those who already own Episode I, a new four-level expansion featuring Metal Sonic will be available for play. Players will take Metal Sonic through reworked Acts from Episode I and help him prepare for his upcoming battle with Sonic in Episode II.
Sonic the Hedgehog 4 Episode II will also be available for Android, iOS, PC, and Windows Mobile Phones this spring.
Official Site: Sega.com