For animal groups:
Old work monkeys: Big step into the right Direction and this is imo the halfway point to good representation. It now is by the truest sense of the world okay enough, covering a macaque, a langur, a baboon and the largest guenon, but it really should also feature atleast a small guenon and a not incredibly rare langur. If we get these 2 then id be willing to call old world monkeys decently represented, now we just gotta hope we will actually get them.
Small Cats: Taxonomically we are good here, but theres defenetly still an open niche for the ocelot. Once we have the ocelot though any other new cat would just be extra
Big Cats: Speaking of "just an extra" the african leopard is just that. Dont know why anyone would need a leopard with a slightly different name and couldnt just use the amur, but now that its here it does literally nothing for the game.
Good thing panthera was allready complete, means that literally nothing changed.
Imagine what new world monkey stonks would look like if the capuchin would have gotten the same treatment, adding in the tufted, such a shame especally as you could actually the two apart.
Goats: The himalaya is good now that it has a goat goat but as many others said an arid one aka the barbary sheep would be neat.
Musk ox also would defenetly add something new and unique, but its niche to a point where its either one of the most needed additions if you want to build elaborate arctic areas or they just are not relevant if you dont, being propaply the definition of extremly important in what it adds but sadly in an area that is generally niche in itself.