During the Xbox One reveal event, Stephen Spielberg revealed that he'll be producing a live-action Halo TV show. Describing the franchise as "myth-making meat" via an on-screen presentation, the legendary director confirmed that he'll be working closely with 343 Industries, and we can assume that the oft-delayed Halo film probably won't be happening any time soon.
Halo: The Television Series will apparently be a "premium" show delivered via Xbox One's television services. We don't know whether it will be pay-per-view or free for Xbox Live Gold members yet. We'd have probably preferred a Halo 5 announcement, but we'll take what we can can get.