I'm just going to list the stuff (non-story) from BiS's vids, and not in any particular order.
BestinSlot has confirmed the existence of Ankylosaurus for the DLC, he has also confirmed placeable lights and Signage as scenery items (including a blank sign, that apparently can be for any dino in the game).
He also confirmed that the remodels are cosmetic genes, which includes Lost World and JP3 raptor skins of both sexes (JP3 male had a weird, probably in development skin, but did have quills).
The Aviary is the only building known to be available in the modern era, yet there is no reskin. Pteranodon is mostly treated as a normal animal, being available from digsites and having a genome to complete, with the Aviary doubling as housing and a hatchery. There are possibly 7 skins for the Pteranodon (I'm not sure how likely the Lost World or Jurassic world ones are there, seeing as nothing was said about them). The animations do loop, but it takes a long time.
Also, Night vision and Binocular research for the safari ride (Jeeps instead of Ford Explorers for that build at least, also no mention negative or positive on driveable ones). There doesn't seem to be a monorail equivalent, with the safari ride being along the lines of the Jurassic tour from Sanctuary. There are two choices of gate for the Safari, one is the Jurassic Park one we've seen
JW buildings like the Greenhouse aren't available (or atleast don't seem to be) in the JP era sandbox.
The helicopter entrance is manually placeable.
The goat feeder skin is more for aesthetic, the goats still move freely.
The factions are separated into Paleontology, Paleobotany and Park Direction, with Dr. Grant, Dr. Sattler and John Hammond as the respective heads. Dr. Malcolm gives contracts linking to both Paleontology and Paleobotany and a young Cabot Finch is subject to Park Direction.