Josh Holmes tweeted out earlier that the Spartan at the top of the Halo 5 Guardians graphic is NOT Chief, Palmer, or Cortana and is a NEW characters.
Here is his tweet:
Frank O’Conner states that the graphic is NOT the final for the box art.
Here is his post via NeoGaf:
So there are two things we can check off the list regarding the newly released graphic. I’m actually VERY happy that they are willing to halt some rumors and/or speculation. It means they are listening as well as do not want Halo to be misdirected into something it’s not.