Well, it's quite sad to say that but I am pretty pessimistic about the future of this game. I doubt we would ever see an aviary pack. I think no zoo game ever added that, and there quite a few reasons. It's hard to properly code and animate flying birds at the same time they try to keep performance and good animations. Not to account the player creativity and freedom. It's easy to have a pre-made aviary where the birds just repeat movements boringly. But creativity and freedom on creating habitats is one core aspect of the game, and we surely want that for aviaries. So yeah, I see Frontier not wanting to dwell in that and why.
An marine pack i think it's quite plausible since we have the foundations since Aquatic pack. Sharks, turtles, rays, new exihibt-like aquaries and so on.
Also, I would love if Frontier could get a little creativity going on with themed packs, like endangered animals pack, botanical pack, farm pack
So, keeping it (kind of) realistic, my dream roadmap:
2021
- August: Africa Pack
- December: Sea Pack
2022
- March/April: North America Pack
- August: Primate Pack (please, please, please) or endangered species-like pack, I dunno, "Save From Extinction","Last Chance" you name it
- December: Farm Pack (petting stations, cattle, goat, sheep, chicken, duck, pig etc)
2022 is unfornately the end of support by Frontier I believe, considering Planet Coaster.