A new TV spot for the upcoming Xbox One title, Halo 5: Guardians, was just released and it seems to paint a grim picture. At the start of the video, the news depicting the death of Spartan 117 or the Master Chief, on October 27, which also happens to be the release date of Halo 5.
Obviously we don’t know the entire store or what happens, at least not until the game drops or someone comes and spoils it all.
https://youtu.be/SENJV2_XuLM
Source: Xbox Youtube