Yeah the bird folk still exsist. Khajiit are a magical split from bosmer, like the orcs.
The Orcs weren't a split from the bosmer, they were their own tribe of mer prior to their transformation into Orcs.
The next elder scrolls game should be on the massive mainland north of skyrim (forgot name) it seems like such an adventure, sea beasts on the way, vampire snakemen that killed every human, great Khajiit.
You are conflating two different continents there. Atmora to the north, was where the Nede race of man went after the races of man came into existence at the Throat of the World. The Nede's returned to Tamriel in multiple waves, cross-breeding with the Direnni elves in High Rock to form the Bretons, cross-breeding with other races of man while under Ayleid slavery to form the Cyrodiils(Imperials) and were the ancestors of the Nords. By mid-Third Era however Atmora had perished under the "Frost Fall" causing the entire continent to become an uninhabited frozen waste.
Akavir to the east, is where the vampiric serpents(Tsaesci), Monkey-men(Tang Mo), Tiger-men(Ka Po' Tun) and snow-demons(Kamal) live. Both the Tsaesci and the Kamal have launched invasions of Tamriel and Akavir has in turn been invaded by the Empire, while the Ka Po' Tun wish to invade Tamriel but want to wait until they have defeated the Tsaesci first. Akavir is also where the Nerevarine lead an expedition to just prior to the Oblivion crisis and the eruption of Red Mountain. If precedent is followed and the canonical Nerevarine was a Dunmer, they could well still be running around Akavir.
I know it was done as an april fools joke a couple of years ago, but I'd be interested in Akavir being the setting for the next game, or possibly the one after if the next focuses on the Thalmor threat, as it has the potential to have some genuinely new things.
Id like for them to have a village being invaded by Sload, kinda like Lovecrafts's Shadow of Innsmouth. I think for all the deities in Skyrim, its the ones we know least about that really creep me out. Like Sithis. Sithis is basically Nyarlothelp.
We kind of had that in Oblivion with the village of Hackdirt.