OH MY GOODNESS! Ok, so I saw this trailer for the first time yesterday when my mom and I went to see "Earth". I have been wired ever since lol. I was watching the trailer and I was like "Dude! They look a little like Gorgs! They did amazing work on these... Henson had to have had a hand in this!" I didn't even know they were making this book into a movie, and now I'm super hyper about it. (I'm kind of obsessed with children's books, especially because I'm currently working on one of my own)
EDIT: Oh, and here's my take on the whole animatronic/suit/cg thing: I believe they are almost completely suits with robotics built in to certain parts like the mouth, and only a few parts (mostly the eyes, sometimes the mouth) done in cg. That's how I've seen other studios do it, and is usually the most realistic/logical and beneficial. You get all the movement a human can make (despite being in a large suit) such as carrying the boy, swinging their arms, jumping, etc, plus realistic mouth movement through a remote-control operated headpiece, and realistic looking eyes through cg.