During The Walking Dead's season finale, Microsoft aired a new advertisement for Halo 5: Guardians, teasing its release date on the Xbox One for October 27, 2015.
In the trailer above, you see Agent Locke walking through a city that has been reduced to almost nothing, where he walks toward a statue of Master Chief. As he gets closer to the statue, Master Chief is laying down pretty wounded and looking down for the count. The ad ends with Agent Locke pulling a pistol on Master Chief, before it goes to black and displays the Halo 5 logo, and 10.27.15.
Halo 5: Guardians is the next big thing for Microsoft this year, so expect a better unveiling at E3 2015 in June before its October 27, 2015 release on the Xbox One.