I noticed That 343 used some certain Spartan numbers for their multiplayer characters.
Arthur-079
Frederic-104
William-043
http://www.halopedian.com/images/a/a0/H4-SpartanOps-EP1-Launch.jpg
Now for my conspiracy Theory 
Im sure a small amount of my fellow loyal halo fans can remember when bungie showed us multiplayer for halo 2.
http://www.halopedian.com/images/3/3d/Prophet_names.jpg
As you can see this is when halo 2 multiplayer was revealed at E3. Bungie showed us the names of the prophets that would be in the halo 2 campaign. bear in mind that not all of those characters were in halo 2 so maybe the halo 4 picture could be a hint made by 343.
I know Arthur and William are dead but hey, Frederic is not…