There are also going to be 10 multiplayer maps with more from DLC down the line. Two new vehicles will debut "plus many of your favourites" return. 50 missions per season for Spartan Ops.
While not specifically mentioned, it almost sounds like Halo 4 will feature clan support when it says they've "improved support to create, organise and track groups".
The planned Spartan Ops, which will update in episodic style, will feature 50 new missions per season, which translates to 5 per week for a total of 40 weeks for the first season. "How many games give you free DLC for 10 weeks?" says ExpertZone. Season one of Spartan Ops will be free to gamers. They suggest it will add 12 hours gameplay.
Halo 4 releases exclusively on Xbox 360 November 6th.