IGN say: 343's Frank O'Connor has explained why Master Chief looks a little different in the reveal trailer for Halo 4, hinting that his personality is going to change as well.
In an E3 interview with Official Xbox Magazine, O'Connor, formerly of Bungie and the Halo series' Franchise Director, had this to say: "There's some story behind his new look... There are specific reasons why he looks the way he does and why some of his behaviours have changed. We'll see in good time."
WOW. Either those authors are real idiots, Or they have nothing to write about and want some hits.
This is a teaser trailer, CGI and not made by 343i.
This mean it would not represent the final game. IDIOTs
Master Chief has been through a lot, he's died a few times.
He's become a cocaine addict since the events of Halo 3 to deal with his PTSD.
Or so I heard.
He wears green spandex and carrys a knife that plays music now
Why not make the protagonist a different person altogether?