For those of you who are confused on what Spartan Ops actually is, it's basically the third part of Halo 4 in addition to War Games (standard multiplayer) and the campaign. These missions take place parallel to Master Chief's story, and incorporate your multiplayer character/loadout.
343 is making the first ten episodes available on a weekly basis, but hasn't really said what will happen after that. Perhaps more free episodes? Paid DLC? I guess we'll see!
In other news, if you're into War Games, SWAT has made its way to matchmaking.