Honestly...
master chiefs face.
I know they want to maintain the illusion that you "are" the chief, but the fact of the matter is that chief is his own person, with his own feelings and everything, the fact is, he ISN'T the player, he's John. So, I'm hoping to see his face, along with the face of all the spartans we see in game.
The characterless hero is what the rookie is for.
As someone who has read the books, the way they treat chief seems sort of...lacking. Like he's simply there to move the story along, he himself isn't important at all. That's...not true. He is a person, acknowledge him.
[Edited on 10.31.2009 5:39 AM PDT]