The War Z is the first survival mmo Zombie Game Made by a company called Hammerpoint Interactive This is looking to be ArmA2:OA Dayz mod's biggest rival and from what weve seem it should be alot better.
Heres alittle info on the game,
It's been five years since the outbreak; leaving in its wake a post-apocalyptic nightmare with ninety-five percent of the human population turned into zombies. In order to stay alive, you will need food, weapons, and other supplies. Some of you will be able to scavenge as you navigate the terrain, others will be forced to fight for survival as you encounter zombies and other bandit players. Every decision will have an impact on whether you live or die.