Today, ComicVine published a photo of some reference figures of the 2014 movie Turtles. These are not action figure toys, but rather they are sculpts that were used for visual reference on set, as well as for CGI animation purposes. And I can confirm that this is not a fake.
Halloween costume photo. Raphael and Donatello and also sporting unique looks. A picture showing more detail of Leonardo (right) has also been posted online by Technodrome forum member RaphTMNT. This picture gives us a better idea of what to expect the Turtles to look like in the finished movie.
And here's a better look at the Donatello reference figure, posted by Technodrome forum user Donnie.
UPDATE: Alas, I've had to remove the images due to a request from Paramount.