Some illuminating interesting information has emerged for Halo 4.
Apparantly, according to a scan of the French OXM, Halo 4 Infection will be renaimed Flood, and infected characters will actually play as Flood!
The desire to play as a flood has always been every Halo fans deepest, darkest secret, with a thousand different Halo custom edition mods allowing you to become one of the graveminds hoardes. I posted the concept art and the full scans below, although bear in mind they are in french (if anyone can translate it would be appriciated)
The bottom right picture is a piece of concept art showing the infected players. The red flood are probably the alpha zombies, and the green are probably infected players.
I am really looking foward to Halo 4 more and more, and really hope that I can get Xbox Live before it's release, because it looks like this game will be nowhere near as good without it!