There has been rumors on some gaming sites that something big is planned in the near future for the WZ. Possibly internal missions you can receive that would change the meta of the game in an instant, going from killing everyone to say, securing an objective or protecting an asset. The best one I have seen (although it would be a long shot) is lots of AI mobs spawning to protect something major like say, a nuclear bomb, and all the survivors have to race to both disarm it and be the ones to DO the disarming.