Lore is limited but from their armor descriptions. Dead Orbit, wants to leave "The City", fearing it's not safe and to make a city elsewhere. New Monarchy - Wants to stay, feeling it's their responsibility to be Justicars. To protect the innocent. Most likely cops/security. Future ar Cult - I'm not sure of. Altho its vendor Lakshmi-2, is named after the Hinduism goddess of "Luck" and granted her followers with wealth and prosperity. Osiris - Has likely been dropped, as it was in trailers but BETA it was non existing. Same goes for 7 Seraphs. There's hardly any info as of yet. But New monarchy sounds cool. A protector of the people. Perfect faction for an EXO.

Where did you find this?!

In the Beta, you could look at the gear that Dead Orbit, New Monarchy, and Future War Cult had for sale. All of this gear had descriptions. Some of these descriptions mention little details about the faction that is selling them.