Someone, probably a big fan of the franchise, took the time to create a short fan film and put it on YouTube. The video doesn’t have any credits, and a link just takes you to a website that just has the video and an email, twitter, and facebook links. The short film itself looks good, though I think the turtle is a bit clunky, but that could just be because of the costume the actor had to wear. Still, very decent and it might give you an idea of what a TMNT rebooted live-action movie could possibly look like if they decided to go all grim and gritty with it.
Thanks to Oldin for the heads up.