That was a cool trailer.
It seems the raptors respect Pratt because he looks them in the eye and stands his ground without showing fear, and may even come to see him as their pack leader or the alpha.
Also, it looks to me like the I-Rex just roars at the Pteranadons to stir them up and get them to fly out of their enclosure. That, coupled with the line about the dinosaurs "communicating" almost makes it seem like the I-Rex is using the other dinosaurs to overthrow the humans and take over the island.
Or I could be overanalyzing.