In a recent job listing on the Microsoft Job site one sentence stands out. “343 is exploring future episodic storytelling endeavors in the Halo universe.”
The paragraph previous to that describes 343s implementation of Spartan Ops and the Halo TV series. The listing is looking for a software producer. It’s fairly safe to assume that this means 343 are looking into Spartan Ops V2, or something similar. You can check out the full job posting here.