The War Z will play out. The game's billed as a persistent open-world zombie survival sandbox, but how will that work in practice? According to executive producer Sergey Titov in a recent interview, the key is making a game that has a wide enough set of tools for a single objective and then allowing players to make most of the actual gameplay.
Titov elaborates that the game won't have any traditional quests or missions; instead, players are simply given the goal of surviving against hordes of zombies. Experiences emerge through interactions with environmental situations, such as dealing with "safe settlements" that have created hard rules to ensure the town's safety against zombies. Take a look at the full interview for more peeks at the game's development cycle, shooter style, and economic design.
[Thanks to Joseph for the tip!]