I'm told live capture will work like in Challenge Mode, so they should have the same frequency as well. You won't be able to exclusive have live capture expeditions.
You have access to all tree sizes in all environments, but you won't have access to one tree from one environment in a different one. So Tropical trees won't be available on a Taiga map, for instance.
The Raptor Paddock is a decorative item. You won't be able to use it as Raptor storage, but you may see some trees swaying back and forth.
We're adding the new dinosaurs to the Database

I don't believe we're adding the characters of places, as this pack focuses on the dinosaurs
Fence inspection? Do you mean the Status checks? You won't be able to disable them after this update, but I will pass on your feedback.
We're adding in the Spinosaurus skeleton from Jurassic World. We'll have more to reveal about the remaining decorations in the patch notes.