We'll just have to wait for more info on the remaining unknown 38 species. Because not many people liked all the dinosaurs I'm pretty sure there was plenty of unpopular ones so we'll see.So far we've not received any information that any of the species from JWE1 are not returning, so I don't think that's a safe assumption.
Pachyrhinosaurus was Mentioned in Fallen Kingdom and had files in Jurassic world Evolution 1 it had a chance of 50-60% but it managed to make it in, Pentraceratops on the other hand isn't exactly linked to the canon so I give it a 20% of possible chance of being added into the sequel game. Styracosaurus on the other hand has a 60% chance because of its link to the novel of Jurassic Park. The reason why I did not put this dinosaur in my list just yet is because there's no strong hard evidence that it's going to be in the game just yet. Media Confirmation, Clear Pictures, or Footage by Frontier that would convince me. Until then I'm assuming some species will be cut in favor of new species or species that are Canon or Novel Canon that didn't make it in Jwe1.

@Darthdeer
Well technically it does, the reason why we're talking about Ceratopsids is because "yes the beautiful velociraptor is better than ever and I love its green skin more than all the other skins already" But with the introduction of Sinoceratops in this field guide I pretty much saw how great the Ceratopsid roster was this time with sinoceratops officially being shown it puts the roster of the Ceratopsids to 6 species in jwe2.
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