That cover is interesting, if it's at all what they're considering for the game. All the Halo covers depict Master Chief (well, the first three). Part of the reason that series has been so notable outside of it's game presence, is they crafted an iconic figure, and based their promotion around that.
the cover is probably not final, but the description says that you create your own character, I imagine it's not like Halo that there is a certain character and that they can put that 'Hero' on the box or something.
and I think the boxarts were made by Microsoft not Bungie.