Oceania would be passable in my eyes with as little as the emu and Bennet's wallaby, but that would only get it to bare minimum status. I'd personally also want to see a minimum of two (but ideally all) out of wombat, devil, echidna, and tree kangaroo, and then the kiwi as well so that NZ isn't totally forgotten. I think that's a beautiful looking animal pack, and would be a perfect sendoff to the region. There's always more that could be done (I want the black swan but not before any of these), but I'd be ecstatic at that point.
Meanwhile, South America could get its own animal pack and would still be just scratching the surface. MENA could maybe get away with a scenery pack (although of course more animals are always welcome).
All of this sort of talk is starting to fill me with a sense of dread, though, because I'm only going to anticipate 11 more species before support ends until we have evidence to the contrary, and that sure isn't many species.