The tundra pack concept really does nothing to excite me, unfortunately. Walrus, muskox, wolverine, even for the most part even arctic hare just do absolutely nothing for me, and they'd mostly be difficult to realistically fit into most zoos below a certain latitude. If we do get an animal pack centered around colder biomes, I'm crossing my fingers for mountains. It would still do little to scratch my biggest roster itches, but at least I'd be happy with some combination of spectacled bear, Pallas's cat, and takin.