Valve announced the next weekly edition for Left 4 Dead 2 mutations.
This one is titled "Bleed Out Versus." I think the title implies that this is a Versus mode mutation, but that is just speculation on my part.
According to Valve there is no permanent Survivor health, you life will drain away as you time advances after leaving the safe house. All life is temporary health, that means you will find no health packs. You will only find adrenaline and pills spawning.
That means no time to stop and enjoy the scenary, it is a shame because that witch put so much effort into that garden. It really does show.
Next week's mutation: Healing Gnome.