In clear sky, in fact, what are the joinable factions which you can join to normally battle against other ones? So far, I saw there is:
Stalkers.(again)
Duty.(again)
Freedom.(again)
Bandits ( again.)
Not So Joinbale Factions:
Firmament (clear sky? Guys in blue? The only new faction?)
Military (doh, not joinable)
Monolit (Fags)
Mercenaries (not joinable??? isn't the main characters a mercenary? duh.)
Mutants (I would like to be a controller, a bloodleecher, or command them)
Rebels? (totally bandits clones)...without purpose..
Ohters:
Traders, Scientics (Ecologists?), Italians.
If there is other ones, don't try to spoil too much. But I would mainly know dezodor, if from what you saw in the game, it's possible to have new factions skins ecetera.. because in fact, there is not much new factions..