Wow, so many positive reactions, I'm shocked.
For me it looks bland, uninteresting with one, literally one amazing shot. That with birds of course. It's beautiful.
But bad sides:
Extremally photorealistic enviroment, which I love, and goffy, rubber like characters, not only Dinosaur, but this human kid as well. They look completly 'stand out', like a characters from different movie. Contradiction with enviroment is strong, too strong for my tastes.
Voice of dinosaur sounds pretty lame too.
I don't "feel" this movie. This trailer didn't sold me that this will be an emotional, beautiful Pixar movie, like f.e. Wall-E was.
So, yeah, that's it. I'm mildly disappointed and uncertain about this movie. But I know that this was only a trailer of unfinished movie, and Pixar rarely has good traielrs. So this might turn out to be a real contender to Inside Outs' Oscar, but who knows.