There will be a total of 6 sub-factions, meaning two sub-factions for each race. In the previews I've read around the interwebs i believe the "original" races without sub-factions will not be included. The sub-factions really just add on to the existing races, not make any massive deviations from what was already there. I'm hoping in due time another race's sub-factions will be included in the beta. Given that Beta 1's focus in TEC balancing among others, I'd imagine other races will be included in due time before the full launch.