Considering how often the top picks make it into DLC, they're clearly paying attention to it... that said, they're also clearly not sticking 100% to it.
Yup, I think we've gotten as many as five animals in the "upper part" (around the top 10) of the meta list at the time of release. That would be the North American pack, but I also think that was an anomaly. If they were only going by the meta list we would have gotten a wolverine as well.
I think 5 from the list in one pack is probably leaning on the list more than we can expect, but I suspect they'll include at least 3, and if possibly even 4, from whatever's in or near the top 10 (stretching that to the top 15). The key is figuring out the theme to make them work.
Tree Kangaroo/Emu/Wombat/Tasmanian Devil are obvious choices for an Oceania pack.
Emu/Porcupine/Maned Wolf/Hairy Nosed Wombat are good choices for a drylands (desert/grasslands) pack.
Tasmanian Devil/Red River Hog/Wolverine/Gibbon/Tree Kangaroo/Sloth could all be good choices for a rainforests type of pack and expanding that further to just forests, the wolverine.
Tasmanian Devil/Tree Kangaroo/Fossa could all be good Islands pack.
Nocturnal - Tasmanian Devil/Wombat/Porcupine/Sloth are all good choices, and the Maned Wolf/Red River Hog have potential as well.
The only popularly thrown out idea that would be a stretch with that (aside from flying birds and marine animals of course) would be a temperate or taiga/mountains pack. The Wolverine and Walrus (if you stretch that a bit) are the only two animals that would fit that are even in the top 15. Granted the Musk Ox is right outside it, but I doubt it would be an animal pack, much less the next pack. Can definitely see it for the next scenery pack though.
With the Tasmanian Devil in 4 of the first pack ideas, and the fact that they're comfortably at #1 on the meta list, I think it's pretty likely we'll get them in the next pack. Unless of course they go the bird/marine animal route.