All hardcoded faction slots for EB1 are full. For EB2, there will be more slots available, but a Nubian or Eithiopian faction probably won't make it into EB2, either. They weren't relatively powerful or expansionistic. Plus, they would have wanted to expand south too, and the map edge stops them from interacting with that area.
See the EB2 forums for new faction discussions, such as Nubia and Eithiopia.
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