Dunno but I definitely want to see these.
Faction specific unique units would also be good.
As would recruitable single figure, stronger controllable units, ala elementals, guardian statues, demon assassins etc.
Basically, units with a handful of special abilities and more unique attributes, instead of 'dudes with melee weapons' and 'dudes with bows'
There are some of these in the game with the recruitable monsters (which are cool), but I'd like to see more of them rolled into the 'base' research paths, races, and city structures.