As if The Walking Dead's season 5 finale couldn't get any better, Microsoft decided to make it the stage for their new set of live-action Halo 5 trailers. The first trailer shows the new guy, Spartan Locke, walking up to a giant stone statue of the Master Chief, with the real Chief laying in front of it. The statue is set in a seemingly battle-torn wasteland, and is the only thing still standing.
The second trailer basically reverses these roles, showing the Chief walking up to the same statue, with Locke at its base.
Both trailers have each character throwing accusations at each other, implying some horrible thing has/will happen before/in Halo 5.
This is foreshadowing at its best. It's going to be a long 7 months until release (that was announced too - 10-27-15!).