I feel like you owe the community some transparency on will all the species in JWE2 be in JWE3, since you want us to commit 100’s of hours into this new game I think you owe us every single species from JWE2 DLC species and all. There are plenty of game developers that are updating and adding to games that are 20 years old,( halo , halo 2, bounty hunter, tomb raider, gears of war, uncharted, midevil,) just to name a few so why could you not just update and add to JWE2, I feel that I’m going to wait until all dlc is released before getting this game unless you can say before the games launch, all species from JWE2 will be added to the game through updates and or dlc at some point during its life cycle.
Development plans change so they can't say precisely which species will be added post-launch. You can play as much as you want and only get the dino DLC that you like.