Bungie is rolling out its new FPS on September 9th, it's called rather grandly 'Destiny' as you'll be aware unless you've been living under the gaming equivalent of a rock.
The following trailer features a co-op mission called 'Strike' and it sees the bros with their huge weapons attacking other bros "beneath the ruins of the Cosmodrome, in the shadow of an old colony ship... in the House of Devils' lair."