Very good to hear the jungle is getting more jungle-y. I agree that it should be more of a green hell than a vacation spot, with lots of exotic creatures and plants.
Henrik has said on stream that they want to wait to add all creatures and plants until persistance release, so as "not give unfair advantage to beta testers". We wil have to wait and see what they have come up with.
That is good to hear. Although considering how screwed up the navmesh is it might be good idea to add fleeing animals asap. Even on Haven you find them going up hills, getting stuck and not dropping loot when being killed.
This issue will be tenfold in the jungle where there enough foliage to blot out the sky.