For 2020 my hope would be for another 2x DLCs like we had in 2019:
Aquatic 'Entertainment' DLC:
Set on a new part of Pena which is at sea-level and includes a new dock building and is headed up by Isaac or Cabot, the first part of the story could be using a new, small carnivorous wetland dino (Vallibonavenatrix) to ensure huge profits in a small space. One of the missions should be to max out the population of this together with a larger new spinosaurid like Ichthyovenator or Irritator and have them co-habit which means you can have a massively profitable Spino enclosure due to authenticity. Completing that mission and getting a 4x star rating unlocks the Aquarium & Mosasaur dig site and helps you use the water space on the map to achieve the 5 star rating.
The second part of the story should be on a bigger map and should lead to a boat tour attraction and the free stuff should be something around improved water flow with the terrain tools, e.g. the ability to add waterfalls and slightly deeper water environments. If a swimming animation could be added for the spinosaurids then the story could be centred around making a boat tour where they are visible but still not a threat to guests due to a newly researchable containment mechanism. Without combining the new mechanism (some sort of frequency emitting buoy placeable in water?) with the boat tour the spinosaurids should be able to attack the boats in deep water where other dinos can only attack in shallow water. I'm probably going too far with this, but another cool thing could be a rescue 'ranger' boat which has the same medicate, tranq and flare ability as the jeeps. The dock building mentioned earlier could also have a function where we can buy/sell dinos and park goods through it a bit like the helipad in the RTJP DLC to tie in with the profit/entertainment story.
I think this would be the perfect DLC to also add bridges and maybe some more aquatic/coastal plants as part of the free stuff.
Rehab & Control 'Security' DLC:
Headed up by Lambert & Owen Grady, this would be set on a new part of Matanceros and can be where we get the breeding a pack hunting mechanics. Pack hunting should be for small carnivores and possibly one or two larger carnivores (e.g. Raptors and Allosaurus). This should include the B@BR Allosaurus remodel and add Amargasaurus as well as a sauropod defence mechanism. New building is obviously the raptor training facility and could add some enrichment items allowing baby carnivores to be trained to hunt something specific e.g. first a pig or cow then as the hunting improves they can pack hunt to take down small dinos, then large dinos and even successfully take down a large carnivore/sauropod together. Owen's bike could be added to the ranger station too and can be used to 'tag' the dino you want the trained carnivores to hunt down.
In the second part of the story, this could be about rehabilitating and releasing baby/juvenile carnivores which are rescued from other parts of the world. Once the rehabilitated dinos are back to full health, fully trained to hunt all of their preferred prey species and grow to adult size they can then be released into the wild aka a true 'site B' which is populated with all of it's natural prey (no goats/pigs/cows or feeders allowed!). Of course, the herbivorous prey can breed so you need to introduce their natural predators to control the population. There could be a human threat in this DLC where poachers try to sabotage your reserve in order to steal the highly prized trained assets. As a final mission to conclude the story a pack of wild and enraged B@BR Allosaurus should need to be taken down by using a fully trained raptor squad to ensure balance in the reserve is maintained.
Free stuff in this DLC should be more terrain tools e.g. a rougher dirt texture, dry grass and a wider variety of natural decorations e.g. dead dino skeletons, rocks of different colours and logs for the reserve. Obviously another carnivorous dino species like Concavenator, Crylophosaurus or Segisaurus could be added with this DLC.