I do hope they make the Tyrannosaurus Rex a key character again. I do find spinosaurus to be fascinating, but the Rex is at the apex of my love for paleontology.
Perhaps we will one day get to see an anatomically correct Velociraptor as well, as the raptorial claw is always depicted in such a way as to resemble deinonychus, a different bipedal species. Dr. Grant even states the claw is on the middle toe, yet it still reflects otherwise. As it is, understanding of the animals, theoretically, has changed radically since 1993, so more than just a toe would benefit from a redesign to stay current.
Deinonychus
Current view of velociraptor