I really doubt those soldiers are supposed to represent zombies. I have no doubt a zombie mode will be included, but judging from that picture it seems more like they are supposed to be part of the characters squad.
The way he looks kinda gives a tone of trauma, which makes me wonder if this years installation is gonna be more mature and less explosive and over the top. It's hard to believe perhaps, but CoD didn't start out as a game equivalent of a Hollywood blockbuster directed by Michael Bay, but as a game that depicted war through a normal soldier's eyes. It would also make sense since they are banking hard on the "going back to the roots" part.