Aviary isn't mentioned on the Steam page specifically, so not impossible, but it is mentioned in the context of buildings introduced by the DLC on the forum post, so I'd say it's still unlikely.
Pteranodon seems to be the only pterosaur we're getting in the update and DLC. It's very possible it will come along in a later dinosaur pack since it is a major species for the franchise. Plus there's also Cearadactylus from the first novel.