A new four-player Teenage Mutant Ninja Turtles fighting game is heading to the Wii next year [...]
Citing Nintendo Power, the story notes that the untitled fighter is being developed by Super Smash Bros. Brawl and Team Ninja veterans.
More sketchy information has pegged the game as a 2.5D fighter, published by Ubisoft and aimed for a September 2009 release. The supposed feature list appears comparable to Brawl, with story, battle and tournament modes, as well as online multiplayer.
http://www.shacknews.com/onearticle.x/56325