This month's ToyFare has an interview with TMNT Supervising Producer, Lloyd Goldfine, mentions a animated TMNT movie to tie into the TMNT 25th anniversary:
Minor spoiler warning.
Minor spoiler warning.
"Last season Leo, Don, Raph and Mike pressed the "fast forward" button and went into the future. They make it back to the present, but someone kidnaps their mentor Splinter, and it's up to our four heroes in the half shell to save him. Unfortunately, a major villain returns to stand in their way. "There are new rules, new powers, and new threats for the Turtles (to resolve,)" says Lloyd Goldfine, (who is producer) and story editor for the series. Not only will the new season end with a wedding, but the show is going to celebrate 25 years of Turtles with a special animated movie. For the old school Turtle purists in you Goldfine assures you you'll go Cowabunga over the movie!"