: So I doubt it's a slip-up and they meant 2558 not 2560.

: Chances are, they're going with a later date because we don't know how much
: time the Halo 5 campaign is going to span. For all we know, we start in
: late 2558 and the game ends in 2560 with the Chief dying.

: Then Locke appears as the main character for Halo 6, until a big reveal later
: that Chief is alive(probably because of the Librarian's
: "Enhancing" his evolution.)

: Just a guess. :3

Sounds plausible. Hell, for all we know, this is part of the ending cutscene...