Bantu Chieftain has finished about 18 new units during the last week,and i've just started to implement them - i've freed up space by removing all the hero bodyguards from the campaign (there were about four unused ones as well), as well as by removing the Frostborn Riflemen (reskin of Khaz Modan Riflemen by WarcraftHero) and the failed Animal Handler unit.
All in all we have enough slots for all his new units, plus two additional slots after that - but Bantu isn't done yet! So i will probably need to remove all the heroes from custom battles with the exception of the two Arthas-models, Illidan, Sylvannas and Jaina. In the end they may also have to be removed from custom battles though.
My idea is to keep all the human units in the coming release, and remove 20 of the Kul'Tiras/Dalaran/Alterac/Gilneas units after the release. That will give us an additional 20 units as there is no need for clones.
Some of Bantu's recent work includes the following rebel-units (possibly regional as well):
Grimtotem Tauren (the Dark Irons of the tauren), Goblins (might become the Pope-faction as they have about 8 units already), Centaurs, Gorlocs, new Frostborn units (will replace the older models entirely as Bantu never liked them), more Quilboars, more Revenants, Zandalari trolls (regionals and won't become a new faction) plus a new Grunt to be shared by the dark Horde, the Legion and the Horde.