A game sort of like Dead Rising but online. Think about it:
Servers would work sort of like WoW's servers, think Zombie for Horde and Non-Zom for Alliance. A max number of players on each server (depending on how big the world is).
Form survival groups (which would be extreamly important, because it'dbe almost impossible to survive on your own). Different jobs offer different skills. Policemen have small arms weapon feat, doctors can heal wounded friends, ect.
If you get bitten, you are transformed into a zombie until a friend gets you a vacine or something. Customize clothing, facial features, stats...Everything.
Cars/trucks would be everywhere. You'd have to find a safe house, and a weapons dealer.
please make this game.