Which faction reforms are already in the game, and which are planned?

[Olaf The Great]

Nabataea have a eastern settled reform and hellenistic reform. The latter lacks the unit upgrades they will receive in the distant future.

Saba have a sort of mini reform as well, having the option to become more centralized and allowing to expand the recruitment of royal troops to some additional provinces.

What's the eastern settled reform do? Add more varied units? How do you trigger it exactly. Same goes for Hayastan, I can't really get into a faction if I think it's roster is incomplete, but I'm really interested in their history as of late.

Also, is there a reason why their capital is a camp and not a city? Is there a way to change this?(Possibly being part of the reform, I suppose)