A few days back, we reported here that the creator of the Teenage Mutant Ninja Turtles, Kevin Eastman, had suggested that there was a new live-action movie featuring the heroes in a half-shell on its' way. Well, Steve Murphy, who has served as a writer for the Turtles for some time, posted to his blog The 5th Turtle, that those rumors are false.
Murphy's post linked to the thread on Heavy Metal where the rumor originated. However, at this time, the thread has been deleted.
So, while there may be plans for a CGI sequel to TMNT, at this time there is no truth to the rumor of a new live-action film.