As you probably know, there are multiple factions (5) We should probably pick te same one if we want to play together on PvP...
[u]The Factions are:[/u]
Future War Cult, Dead Orbit, New Monarchs, Osiris, Seven Seraphs
those wanting to research, here is all the info there is... It will be updated as soon as they know more ;)
http://destiny.wikia.com/wiki/Faction