It's probably being developed separately.
That being said, I'm disappointed that Activision clings to the PS3/360. It just means the the PC/PS4/Xbone versions won't reach their full potential.
Not that I really care, CoD has been reserved to my DO NOT PLAY list after Modern Warfare 2.
You're Gonna Carry That Weight.
Xbox One - PS4 - Wii U - PC