SEGA today confirmed the name of the forthcoming Sonic RPG as being Sonic Chronicles: The Dark Brotherhood.
It's for the DS. It comes out in 2008.
It was developed by BIoware, and they know more than a little about how to make a compelling role-playing game.
Rumor has it the game will feature 11 playable characters and the gameplay reveolves around rythmic tapping, like a music game/rythym game. For more info, pick up February's Nintendo Power magazine. They have a full spread.