Sonic the Hedgehog 4 may have been put on hold in favor of Sonic Generations, but the game is still scheduled for 2012. Now Sega is detailing a few of the changes coming to this second installment of the episodic franchise. For example, Tails and Metal Sonic will make their return to Episode 2.

A GameSpot AU interview (via Kotaku) with digital brand manager Ken Balough details the new additions. Complete with Tails-inspired facial hair, Balough announces that both the foxy sidekick and Metal Sonic will make a return. Plus, due to fan feedback, the game will feature a new graphics and physics engine. Balough says this should solve certain problems that didn't feel like the Genesis games, like Sonic sticking to a wall.

When announcing platforms, Balough mentions PlayStation 3, Xbox 360, iOS App Store, Android, and Windows Phone -- but not Wii, which received the first game.