I think after Halo 4 is released on November 6, the following day I think some if not all of 343 will be back at work making sure matchmaking and any other in-game services/features are working properly.
Towards the beginning of December I think 343 will be closed, and everyone will be on vacation.
Sometime in January I think everyone will be back at 343, and work on the first map-pack would start, or start to pick up steam <mark>if it is already somewhat underway before 343 goes on vacation.</mark>
I also think development of Halo 5 would also pick up steam, <mark>if it is already somewhat underway before 343 goes on vacation.</mark>
By April 343 might release the first map-pack for Halo 4.
Is the a possible outcome after Halo 4 is released ?