Looking at the trailer, the "hybrid dino" still in its enclosure after the marks have been left by its assumed escape and the cuttlefish camo DNA rumours, I would assume the main reason that the dinos don't have feathers is because then it couldn't go all chameleon and I'm betting that is a big part of the plot.
Also, on the Raptor/Chris Pratt thing, I've heard alot about "training", "dna manipulation" or even Dian Fossey-style acclimatisation but given that dinosaurs are ascendant from birds, I think the most sensible conclusion is that, like many birds, some dinosaurs will imprint on the first person they encounter (Hammond mentions this in the first movie, and we never see him interact with a grown dinosaur). Many species of geese and duck will treat the first animal they see as their mother, so perhaps Pratt is the mother-raptor here? I think it is a more sensible inclusion, than the other theories.
Also, on the Raptor/Chris Pratt thing, I've heard alot about "training", "dna manipulation" or even Dian Fossey-style acclimatisation but given that dinosaurs are ascendant from birds, I think the most sensible conclusion is that, like many birds, some dinosaurs will imprint on the first person they encounter (Hammond mentions this in the first movie, and we never see him interact with a grown dinosaur). Many species of geese and duck will treat the first animal they see as their mother, so perhaps Pratt is the mother-raptor here? I think it is a more sensible inclusion, than the other theories.