User blog comment:LOTRMod/Ask Boyd Anything!/@comment-26296200-20160704215508/@comment-26127220-20160705051529

Karseius is always adding more to Harad and the southern biomes. Including Umbar. So it just depends on when we have time for them.

I am pretty sure the Black Númenóreans will be Umbar faction specific when they get added though.