I am a huge Turtles fan. I must say this has me slightly optimistic.
The problem is still the Turtles designs...and I am not just talking about there faces. Nothing about them look like Ninjas. But to make matters worse they are still extremely over designed. Donnie is my favorite character, and this design is just insulting. It is like, we have to make sure you visually know he is the smart one. Nick's cartoon series did a great job of showing the Turtles personality in their design without over doing it.
I am also worried about their personalities...everyone said they nailed the Turtles presentation in the first movie, but NO the didn't. Leo which is supposed to be the leader and the overly concerned one, just fought with Ralph or did nothing. Ralph was the leader and character with an emotional arc, and Donnie and Mickey were left to be caricatures of the cliched characters they already were.
This looks better because it captures that retro feel of the 90s cartoon series, and honestly that is what they really need to push for with this series go extremely retro and go over the top. Finally, if they can get some humor to make fun of the genre as a whole then it will be even better...but that last one won't happen.