I truly have no idea what those sounds were except to say that #1 sounded like a monkey or a bird and #2 sounded like a mammalian carnivore. FWIW, during the Twilight stream they definitely teased the raccoon noise and then straight-up showed the stuffed raccoon if I recall. So #2 could be a fossa still. But I have no idea. And then there's the "hog" mishap which makes
But then there's the "hogs" slip-up... And I really kinda feel like she would have said "pigs" or something if it were a species with that in the name. "Pigs" is the default for animals of that type, really.
All that considered: I am thinking it's a tropical/rainforest themed pack rather than islands. Fossa, red river hog, maybe an ocelot, and a monkey... With a flying fox, some tropical birds (multiple macaw variants or songbirds), or a sloth for a walk-through habitat (even though I think a sloth as a walk-through exhibit would be regrettable).
Even if it were islands, I think we'd DEFINITELY have recognized the Tasmanian devil's yowls, TBH. They wouldn't have skipped that opportunity. But hey. Maybe the next pack will be a "Temperate Forests" animal DLC.