This almost got lost in amongst all the other big news of this morning, but just in case you happened to miss it -- a new Halo 4 trailer dedicated to the Spartan Ops co-op was released, and it looks a little bit spiffing.
Spartan Ops is an episodic, separate co-op campaign and 343 Industries plans to release five new 15 minutes missions each week. 'Season 1' of the content comes free with the game itself, and will deliver 50 of these missions.
Spartan Ops is set six months after the events of the main Halo 4 campaign and, having played a fair bit of some of the missions, I can vouch for its dumb, firefight-esque fun. From what I could gather, Spartan Ops basically takes players from one encounter to the next. It holds up well, and I'm looking forward to playing through it with some of my friends.
As for the trailer above -- it's pretty spectacular and a real testament to the resources Microsoft is throwing at this game. Well worth watching.