Most likely:
- ford explorer skins for the JT tour
- '93 building skins
- one new building
- three new dinosaurs (segisaurs and i have no idea what else)
- movie skins for raptors and rex
- 2 new maps ('93 nublar and Lost World Sorna)
- new acu copter skin?
less likely (but hopefully):
- one new ride (cretaceous cruise, hot air balloon)
- third map JP San Diego (sorna map would work like claire dearing dlc nublar north where you and tembo go get dinos to bring to the next map)
- more decor
I'd go with 4 maps. 93 Nublar, 97 Sorna, 01 Sorna, and San Diego. Making it a full JP based one.
A major raptor variant for the JP3 type ones, a cosmetic skin similar to the camo for the Indominus (I'd love to see a variant of that for the Raptor and Carnotaurus as well).
I'd add another "tour" type attraction as well, a parasail type station where it would both move guests between stations and have the look from the Dino-Soar thing from JP3.
For buildings, the visitors center as a big one along with something like the shed where it works as a relay with a later research that lets you attach it to specific structures and/or pens with a relatively storm immune power generation for a much smaller thing for a limited time (Say it functions almost as a battery for what it's attached to, the more it's connected to, the less time it works before it runs out until reconnected, but gives you a couple minutes grace time for more troublesome things. A shelter upgrade into a bunker would be another there.
As I expect we're getting another dinosaur pack shortly after it (Like we got one a few weeks post Dr. Wu), and possibly another skin DLC if we get another Jingle Jam type one.
I'd love to see a Ride based DLC as well, either as part of it or separate.
Having a ride similar to the track one for the Explorers, but in water using the Jurassic Park the Ride style vehicles with alternate skins using the JW The Ride ones along with variants using the kayaks and larger ones from Jurassic World. Having the Ultrasaur and Psittacosaurus in it along with a variant of the Compy...while smaller than current dinosaurs, having them released in groups of 3-4 that are treated as a single dinosaur...which would make it easier to keep track of them, and let them make their semi-iconic swarming from the movies and books