I'm hopin' to see the Parthians. They'd have a nice horse-archer unit (maybe a 2/1/3 instead of a horseman?). They could also use another African nation. Maybe Boers or Berbers (though the Berbers would be right on top of Carthage in the world map, and the Boers would have to encroach on Zulu territory. In case I'm wrong about that though, keep in mind, I haven't done African histroy for a while... )