PTG hinted to their eyes being red like in MOTD, but in that hint they said something like just because their eyes have color doesn't mean someone has to be controlling them, so maybe red is the color element 115 turns the eyes into.
Mob of the Dead had Red eyes right? Well Samantha wasn't in control. No one was. So they will most likely be Red.
Red is most likely, but who's to say samantha was the first to control the zombies, I mean how do we know the MPD was empty when she found it?
But no one was in control until Samantha got teleported to the moon. Well what is 115 doing on the moon in the first place?
115 is from a meteor right? It could just as easily have crashed into the moon just like earth.