[Poison Shadow]

And bigger, clearer pics of their designs via promotional artwork here.

Mikey actually looks exactly like the Halloween mask, which I can't say I'm happy about. He really does look like Shrek.

Donnie seems to have more of a beak than the others, which I like. Leo seems (to my eyes, at least) to be directly between Donnie and Mikey - he's got a more rounded "snout" but also has those weird pronounced lips. Raph skews closer to Mikey.

I like the basic aspects of their designs, namely the outfits. They tread dangerously close to being overcomplicated but I think they look great. I'm also pleasantly surprised by that pic of Shredder that is floating around, but I'm reserving judgment of him until I can see either the movie or the toy that is made from it.