We're getting 2 "new" animals with the Spider-verse series, so I think if the new series is animals, even if costumed, we'll get some animals. Maybe not brand-new, but I wouldn't be surprised if they were. Lately a lot of animals have been appearing in CMFs first and jumping to the sets later if they're lucky.
We are getting a unicorn foal, so your dream doesn't seem that far off. CMFs are the perfect place to introduce figures & animals that don't exactly fit, aren't they? Besides, the explorers already found a mammoth and a saber-toothed tiger, and they're in the Arctic again. If they won't come with CMFs, they may appear in some explorer sets in the coming years, I think.