Season 1 teased
After finishing the campaign in Halo 4, the story will continue episodically with free weekly installments of Spartan Ops. Previously, we've been shown more of the missions themselves than the cohesive story they will tell, which is addressed in this latest trailer.
Even if that narrative falls a little flat, this should still be reason enough to stick with Halo 4 long after launch week, to say nothing of War Games. Having seen some of the higher-end cosmetic items, it's going to take some time before I have my ideal set of armor built and Spartan Ops could prove to be quite helpful in that regard.