Valve has revealed that the fist Mutation mode in Left 4 Dead 2: The Passing will be Realism Versus.
Explained over on the game’s official blog, Realism Versus will last a week before it’s replaced by a new one.
The first mode, a variation of Versus, will have Realism features working against the Survivors. There will be no glows on items or survivors, the zombies will be tougher, instant kill witches, and the Infected have the opposite.
This makes the Jockey one of the most powerful Specials for his ability to steer a Survivor out of view. We hate those things.