IMO it's pretty likely. Oceania isn't as much of a wildcard as we assumed, I think. Looking at the in-game continent tags, the only two that haven't had a DLC were Oceania and Central America, along with Asia as a whole. We've had South America, North America, Europe, and Africa.
I could say that the Winter DLC will be an Asia Animal Pack with a focus on the Himalayas northward (which would include the wolverine, markhor, so on) but part of me still thinks it will be a biome pack with a primary focus on Asia.