Well, there's the rub, isn't it? The ideal would be a Latin America scenery pack followed by a more global, broader, and expanded animal/scenery pack to end things. Because that's where we're at pattern-wise.
If the next pack is truly the last one I suspect it will be more like an animal pack + scenery. And, I dunno how the community would react to that at the expense of the secretary bird, tree kangaroo, musk ox, baboon, markhor, grey crowned crane, etc... Especially if the size of the pack really showcases the end.
Personally, as I type that out? The LA pack honestly works better for me (save for my beloved tree kangaroo!) but it just feels like a last animal pack roster would likely be more global to me... And taking that stance they could still get the big LA species in (coati, spectacled bear, howler monkey) while bringing in some of the other heavy-hitters from other areas as a "best of both worlds" sorta thing.