I caught a few minutes of Gravity Falls (I keep being told that it's really good, along with Motor City), and the boy is voiced by a grown man, and it sounds like his vocal cords finished puberty before the rest of his body did. It's weird.
That new Ninja Turtles debuted today, and it's ok. I didn't like the visual style, but upon seeing it in action, it grew on me.
I have no idea how the mutagen is supposed to work in this one. At first I thought it was 80's cartoon rules, because Hamato Yoshi and Splinter are the same person in this one. But then an original mutant pops up and it looks like the mutagen just works randomly.
EDIT: Seeing it again, I guess it's 80's rules. With their new character they just didn't make it obvious as to why he turned into a giant weed, but if you look for it, you see it.
I find it interesting how they have the Utroms as part of the first story arc, but this time they're bad guys and are some kind of collective called the Krang. That's ok. You're always going to have to address the Krang thing somehow.
Why the hell did they de-age April? They made her a teenager now. Why?
Little nitpick. They seriously couldn't have been eating algae and worms for 15 years down there. It's just a set up to have them love pizza so much (so they're bringing that quirk back! I smell tie ins!), but it makes no sense, especially when in this version, Splinter used to be a human.