Here is some gameplay from the new 'TMNT: Smash Up' coming to the Nintendo Wii September 22, 2009.
Teenage Mutant Ninja Turtles Smash-Up is a new Teenage Mutant Ninja Turtles fighting game, and has so far only been confirmed for Wii. It has been in development for about a year, and is being developed by Game Arts, who had previously worked on Super Smash Bros. Brawl, and several former members of Team Ninja, who previously worked on Ninja Gaiden 2. The full title of TMNT Smash-Up was announced on January 23, 2009. The game will not be specifically tied to any previous Turtles license, yet bears the same artistic style as the 2007 CGI movie, TMNT.