For my opinion I would like to see the new Zombie, have a very random spawn, be it in the forest or city. At any time any place as many as you like, have the the ability to Rome around, this would make players explore more of the map, make PvP players look over there shoulder, and not just blast away all day with a sniper, just cos they have loads of ammo. They as other players will need to keep an eye out for them roaming around,