Seems like this is quite the polar theme as far as pinside goes based on the number of other people chiming in about it in other threads, but personally, I think it would be tubular to have a decent TMNT pin in my line up. The irony is, this is probably the one license, NO BODY WANTS BASED ON THE MOVIE(S). Looking at Jurassic Park and everyone moaning about it not really having any of the iconic movie references (even though it was an epic book first and foremost), TMNT is similar in that it's roots run deep in graphic novel format and was adapted later for main stream viewing. Which, like JP, would give STERN (or whoever) a lot of freedom in what they ultimately could do with the game, not being tied to redundant movie clips.
The TMNT universe has so much to offer design wise to build a unique playfield that incorporates theme such as their secret underground lair accessed via subways/sewers/etc., tons of characters and villain content (the 4 turtles, Splinter, Shredder, Shredder's foot soldier army, his goons bebob and rocksteady, Krang, April O'Neil, Casey Jones, the news van, etc.) along with an art style that really has a lot of options - - as long as it's iconic, and at the heart is comic style oriented. The original masters would do the theme the most justice, but based on the work that Zombie Yeti has done recently, I truly believe that he would knock this one out of the park.
As far as all of the nay-sayers complaining about it being an old theme for old dudes, and that it's just nostalgic for a few people, they clearly don't have children. My 6 year old has been a TMNT fan since he found out about mutant turtles that learned to be ninjas. The theme passes generations and will continue to be relevant in years to come. Just like Jurassic Park and dinosaurs.