Not gonna lie, I'm a little skeptical of most of the DLC ideas floating around. Dong get me wrong, all the themes are ones I would be over the moon happy with, but I feel most of the community, myself including, looking at crafting DLCs strictly from a "zoo nerd" perspective. Let me clarify, I'm not policing people on how they speculate, that's ludicrous. But, in my opinion, there are more aspects to animal selection and theme than what animals seem to be highly requested. We know certain animals cost more to make, especially if they are making a new rig (I think, I have no background in game development). Marketability is also something taken into account I'm sure. For example, a red river hog or a peccary would knock the majority of our socks off, while to the general public, it's just a weird pig. It seems now, that most of the player base, or at least the people who ate vocal about the game are zoo/animal nerds, so maybe this is less of a priority now than at launch.
To actually share my opinions, as much as I want a Rainforest Pack or an Islands Pack, they seem like ways to get a ton of ani.als the community really wants. That's kind of it. I still think these are likely since the game is sadly getting closer to loosing support.
Ever since the Europe Pack, it's been really hard to speculate. There's been no leaks, and there is no obvious pattern in the previous themes. I think back in 2021, I heard someone said PZ speculation is dead because of how predictable the packs and rosters were. I would say that is true today with how unpredictable the DLCs are
So, what I think I can say for certain is that we will get at least one animal from the top ten on the meta-wishlist if its a scenery pack, and if it's an animal I wouldn't be surprised if we got at least three.