A new ViDoc for Bungie's Destiny is scheduled to be released at 7pm CET (6pm BST) this evening.
Focusing on the 'social experience' and how the world is integrated into that idea, it also highlights a little more about the character you build, their race and class. Used across all game modes in Destiny, the featurette also explains how the three-weapon system works.
You primary slot revolves around assault rifles and your more expected guns, whereas the special slot is better for, as the developer describes it, "in the moment options". The new 'heavy slot' exists to cause nothing but out-and-out damage and destruction.
Keep an eye on Bungie.net to watch the ViDoc later today.