I don't believe we would get that sort of stuff for new factions. I don't think they'll stray from the Rune Wars (and possibly Rune Age) lineup of factions. The name might be a clue
However, I think it's fairly safe to assume that if the game does well, we might get the oddball stuff - razorwings, giants, goatmen, pod-people or whatever else - as 'neutral' or 'mercenary' figures. Again, just like Rune Wars and Rune Age.