A few months ago, it was revealed that Peter Jackson was done with Halo. Following a rumor that Steven Spielberg was interested in attaching himself to the project, Microsoft later confirmed that a movie based on their blockbuster franchise had officially been "put on hold."
So where does the Halo movie stand now? There's not much new to reveal, but Microsoft certainly understands the value of the IP and seems pretty open to kickstarting the movie at some point. Microsoft Game Studios head Phil Spencer commented, "The Halo movie, you know, it could [come back into play]. I think about Halo as something that's very important to us and something that we wouldn't want to jeopardize the quality of the IP by getting into a space where we didn't have shared goals with the partner and that the timing worked."