- last post: 01.01.0001 12:00 AM PDT
They have not and never will. It is in Bungie's opinion that they should not release a picture of his face because they want the player to feel like s/he is the Master Chief. Giving him a face will most definitely alienate someone and they don't want to do that.
But the closest thing you'll get to his face is inside The Fall of Reach. Basically he has brown hair, a few freckles(probably gone after that much war), and from what I can tell he is caucasian.