Sonic the Hedgehog 4: Episode 1

Sonic the Hedgehog 4 (originally titled "Project Needlemouse") is an upcoming, episodic WiiWare game starring Sonic the Hedgehog. It is meant to be a direct sequel to Sonic the Hedgehog 3 and Sonic & Knuckles, and will incorporate motion controls.

Story
After destroying the Death Egg, Sonic decides to take a break from saving the world and explore new places. Unbeknown to him, though, Dr. Eggman is still alive and is setting a trap to get rid of Sonic.

Gameplay
Sonic the Hedgehog 4 will be a side-scrolling platformer, just like the original Sonic games, and will include levels reminiscent of the older Sonic games.