Just to continue to throw some random speculation out there.

Frankie and Bonnie Ross both made odd hints at something big about our new journey in 2014, and the bit about the 360 still having tricks up its sleeve. Now assuming this isnt a H2:A reference, I wonder if the Spartan above MC will be the main character of a Spartan Ops Season 2 or something along those lines releasing this year. My first thought was that the armor was similar to the Recruit armor set, and as such just a place holder, hinting at customization.

But this would assume that it wouldnt run the new engine...so I may have just debunked my own idea.

Lastly, Im really hoping for the dual-character campaign, the plural subtitle and the screen shot really suggest that to me. I mean it really is significant in that the announcement for a new Halo game, they place the face of the franchise (perhaps of Xbox in general) underneath this new character. Again, assuming it isnt the MC.