While 343 Industries didn't have a new Halo game to announce at the Xbox One reveal event, they did however reveal a new Halo live action TV Show, with involvement from critically acclaimed film-maker Steven Spielberg.
The new TV show will be appearing exclusively on the Xbox One console, however no further details were provided. Steven Spielberg briefly appeared on-screen, stating that he was excited to work with "the heroes, worlds, and wonders that Halo will take us to." It is unclear whether the series will air at the launch of the console later this year.
You can catch the full recap of Microsoft's Xbox One reveal over at the official website