Given that we already have received tons of Christmas-related scenery items with the Arctic Pack, I wouldn't really expect that. If the aesthetic of the teaser screenshot is anything to go by, I would rather expect Mediterranean scenery - but even that only assuming that the screenshot actually has any relevance to the contents of the next DLC, which the past has shown isn't always necessarily the case.
If we do get a European scenery pack (which I'd absolutely adore!), I'd say Mediterranean or Alpine scenery would be most likely, although I'd actually give a slight edge to the prior.
It's funny how different opinions could be. A European Pack would probably have me more excited than any other pack, to be honest.

If it was a Europe Pack with Red Deer, Eurasian Lynx, Alpine Ibex and European Badger, I'd be over the moon, with wolverine, red fox and crested porcupine as honorable mentions (the latter of which might go well with a Mediterranean theme).
The only zoo I could think of would be the Zoom Erlebniswelt in Gelsenkirchen, Germany, where you can eat out in the Asian Tropical House with free-roaming birds and bats. I haven't experienced it, but theoretically the flying foxes could roam around your tables (some of the free-flying birds definitely did). But since we don't have either birds or flying foxes in the game as of now, that isn't really an option to recreate.