If you split hairs like that, the only truly new thing this year was......nothing.
Every animal technically can be put in the habitat of another, the gibbon is another gibbon, monitor is a croc light, sandcat is a feline fenec fox, porcupine is a spiky aardvark, quokka is props the most unique as a weird kangaroo bunny rat, witht he ladder two being things we just do not have and the mute swan is another flavor of flamingo.
If you wanna do it like that, the only truly "new" animals would be flying birds and aquatics, with an argument for petting zoo animals, most importantly guinea pigs and rabbits as they arnt ungulates.
If we want to see it cynically, everything is the same, the red kangaroo uses ungulate paddocks, every climbing animal is the same and the only thing that differentiates animals are deep diving, climbing, group size and overall size.
But thats not very helpfull is it?
If you want "new gameplay" in a sandbox game that just gives us new goodies as dlc, then you have to hope for the free updates to actually make this game worth as a management game, cause thats where the gameplay lies if your unsatisfied with just building habitat nr 50+.
If building bores anyone, then new animals wont fix that, management updates will.
And for the building crowd, last year was amazing in an understated way of giving us more choices and variety.
I bring up this exampel for the 4. time or something, but before the arid pack, north africa was technically fine, but you had just so little variety in animals that your areas wernt defined by what you put in them as much as they were by how much you left out of the 4 animals we had. Now post arid, building a new north african area actually brings that choice, that breathing room for creativity of actually being able to pick and choose what goes there.
Are 5 ungulates in one pack excessive? Absolutly, but now we got a choice of 5 desert ungulates instead of just returning to the scimitar horned oryx all the time.
We have two small predators, 2 mid size predators, a domestic, an equiid and even some more base game animals that qualify if you want like the ostrich and cheetah to actually have a choice to build expansive and different north african areas instead of just another subsaharan africa savannah slog with maybe a desert subarea and even if you wanna build that, that desert subarea is now much more unique cause you got much more choice.
So while it wasnt exciting, the polish this year brought was wonderfull and easily overlooked and the only reason people are salty about it is SAs sorry state and the fact that the ungulate quota really was very high this year, both more then valid.
And anybody not hooked like this will not come back for birds and fish, or atleast not for more then one pack, valueable sales sure but even if we are the niche diehard fans of a niche game, any "casual" still playing the game and buying dlc is not so different to us here. If they are sitll playing and buying, its because the game how it is is fun to them and they like adding new flavors, even if they arnt mindblowing.