Destiny's cooperative play is built on the most stable structure in nature: the triangle. Its three-player Fireteams are "bound by blood (and netcode)," according to Bungie in a recent Q&A on the PlayStation Blog, but there's still room for lone wolves and bigger parties.
Public events will pool players into specific areas with similar goals, though these can be seen and ignored by those with better things to do.
Competitive multiplayer and raids, on the other hand, will round up players for planned expeditions. Bungie said it wasn't ready to discuss details on either yet, other than the studio is currently playtesting competitive multiplayer and that gear earned in cooperative play can be used in competitive, and vice versa.
Assembling and customizing gear is a huge part of Destiny, Bungie said, and players should be able to glean the story of other characters largely by the armor on their backs and the weapons in their hands.
Destiny is coming to PS3, PS4, Xbox 360, and Xbox One in spring of 2014, with a beta scheduled to begin early next year.