This appears to be another of those, not so secret projects. There have been a number of classifications around the world for a brand new Teenage Mutant Ninja Turtles game, produced by Activision and developed by Platinum Games, but now there are screens from it.

While no other details are known, its full name, platforms and release date, the screens do provide a clearer look on how combat will perform. Based on some of the poses, I would guess that the game will stick with the Platinum style of combat, but with each of the four turtles having a different core set of moves. Also, due to the number of screens where more than one turtle is in combat, I would expect it to contain some form of co-op gameplay.