Mountain animal pack could be interesting for sure. And I'd also appreciate a cold weather animal pack. I just don't really know what kind of animals would be in it. Musk ox and a hare for sure (arctic, snowshoe). Other than that? I don't know.
Mountain animals however, I DO know what I want:
Takin species (prefer the golden)
Small mountain cat species (Pallas cat, Andean mountain cat)
Southern viscacha
Mountain hare
Spectacled / Andean bear
Chamois / Wisent
Asian highlands antelope species (Chiru / Tibetan antelope, Saiga)
That would be 2 predators (SA finally gets its bear, and we get a small cat species either from the Andes or Himalayas), three ungulates (the largest goat in the world, an Asian antelope, and either an extra Alpine animal or one that lives in East European mountains), a rodent (viscacha), and the first lagomorph. South America would get 2 or 3 additional animals which is really nice. Also an extra animal for Europe, and three animals from central/north Asia.