Question: When we release the mod, what would you want us to do? Further improve the factions or add a third faction? (Just asking, nothing will happen until we decide)
For me the priority should be bug fixing and introducing more maps.
After that I would say implementing Gas, since it is already being worked on (?), then after that introducing a third faction.
Adding more units to the already existing factions I would leave to the mod teams' discretion, since this is something that could be worked on by the modelers as a side project while the rest are implementing other things.
And besides, since I don't know how many units are going to be in each faction in the first place, I question if adding more units would be necessary.