At the time of the precursor still fighting the flood, there were a lot of AI is raging and joined the enemy. Most of them were destroyed, but if 343 want to dive back into this part of the history of this part of Hal AI might alive and well, and harboring a grudge against the leader.
In addition, even though all the prophets of the end of the Federal were killed Halo trilogy is always a good chance that some of the species Shyuum San 'somewhere in the universe exists. Halo Contact Harvest novel suggests the same thing. The pact has always been an important part of the Halo series and Master Chief, just like master chief costume so I'm not surprised that 343 are not included in Halo 4, one way or another.
Towards the end of 2010, said Microsoft Game Studios corporate VP Phil Spencer IGN: "There is no explicit strategy that we deliver a Halo game every year, says Will say that I think one Halo game every three years - which. Kind of our old cadence was - probably not often enough "annualized admire came Activision Call of Duty, said:" 343 Industries is a lot of thought such as the use to do this franchise and turn it into something people feel a lasting. Relationship with them and can usually get. "
Spencer pointed out that it did not intend to create a Microsoft annual production plan by a certain date, but the company is certainly more interested in what. The fan of Halo the real question is where is the Xbox 720 is adapted to these plans?