New faction or exclusive content, E3-ign

Ok so I was reading about destiny on ign and found this "Then there are the characters we’ll be encountering: fellow Guardians in at least the Titan, Warlock, and Hunter classes; the Fallen, the time-traveling robots known as the Vex, the aforementioned Cabal, Spider Pirates and their rusted machines, evil space zombies, the FOTC (apparently a Guardian faction of some kind) and...that's everything they'd cough up for now." On the line above you'll see FOTC. You may know this hasn't been announced yet but is this a new faction or exclusive content. Being honest I really don't know. But I've seen this before in the ps4 announcement for destiny it's on the blue titans gun. When it zooms in on the Titan look closely and you will see FOTC. And another thing is that Bungie said"see you at E3 in a comment or video I cannot remember so I'm guessing there will be some gameplay! To be honest I am excited. So tell me what you guys think. Do you thing FOTC is a faction or exclusive content. And do you think that there will be gameplay at E3 of destiny well thanks for reading bye.