– official title is TMNT: Smash Up
– dark, gritty graphics
– some real-world inspired locations: Manhattan skyline, unspecified jungle arena, motel roof
– defeat opponents by depleting health meter or via stage knock-out, much like the Smash Bros. series
– some context-sensitive moves
– no motion-controlled attacks, but there will be motion controls for other aspects
– levels change as you fight, start in one location and end up in another
– pizza restores health
– Peter Laird (TMNT co-creator) is writing the single-player story
– Mirage (comic publisher) is filling out the roster
– Splinter and the Turtles are the only confirmed fighters thus far
– 4-player online reconfirmed

Link