What I think we will get:
-5 more campaing missions each with 5 new maps;
-Dominion Chaos Theory (possibly using Byosin and the location in the trailer);
-DFW: Jeep Tours, signs, Power Station upgrades;
-movie maps (Socotra Island where they filmed the Prologue), Malta, Tundra);
-movie skins (prologue and rest of the film);
-creatures (Dimetro, Atroci, Pyro, Lystro, Microceratus, Quetz, Theri, Ovia, Moros, Protoceratops*).
I am not sure if I am missing any creatures that we have yet to know of but a round 2 of CC DLC where we have the remaining CC skins (Firecracker and Little Eatie) as well Smilodon (with more Mega Fauna) and the Spinoceratops given that we are getting CC Season 5.
Jurassic Park/World extensions maps (Nublar East, Nublar South, Nublar North East, Lockwood Manor, 5 Deaths (both JWE 1 Sorna maps as well all the 5 Deaths maps), Sanctuary, Azores, Guam and Kenya) would be grand.
I forsee a few QOL updates between April and June as well.
*Edited the name of the ceratopsian