just installed and had a quick look at Hayastan. few minor things. one of the rebel stacks in Armenia Minor (Pokr Hayk) is lead by a fella called Hasan. this is an Arabic name and is out of place. also, this Hasan's portrait is Gaulish, which is also odd. talking of the rebels in that region, I would add a few Armenian spearmen into the mix just so they have some presentation among otherwise Anatolian, Iranian troops. and maybe give a rebel leader inside the settlement there an Armenian cavalry or Anatolian horsemen as a bodyguard to reflect both local ethnicities and regional elite's preference for the mounted warfare (his unit is made of Iranian footman atm).
On the menu screen when choosing Hayastan, the short campaign still (it has been reported several months ago) asks player to conquer 40 regions as opposed to standard 20 that other factions have.
new Armenian bodyguard unit lacks description.
cheers