World Zombination looks to be a simple yet entertaining strategy title. In the demo that was available at PAX, players would select from a launch point to release hordes of zombies to attack humans and hospitals while completing the mission within 5 minutes time. There is human resistance to get past that does grow more difficult, but as players defeat humans they'll be able to unleash different zombies by mutating some of the current zombies. These zombies are faster, stronger, and more capable of defeating humans.
Also, for players who are fans of human beings instead of zombies, the demo allowed players to take the role of the humans instead in a defensive format. The same horde of zombies are out to get all humans and destroy the hospital in 5 minutes time, but it's now the players job to stop that from happening.
World Zombination is set to release sometime next year.