I'm thinking it's Eleutheroi, considering there was special attention paid to them in the update on the EB site, as well as the fact that it's the easiest way to add 2 "factions" while still keeping all the old ones. Maybe more specific different types of rebels in some areas or something represeting sub-factions.
Then again, if it's 2 actual new factions then just... wow.
-edit-
Oh, looks like BB had the same idea. I think we're onto something here!
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