Wikipedia has this list of (possible?) upcoming mutations for L4D2:
- Realism Versus
- One team of Infected tries to take out another team of Survivors. In Realism Versus, Survivors cannot respawn in closets, halos around items are invisible, infected are more deadly, and only infected can see the Survivors’ halos.
- Bleed Out
- A team of Survivors must make it to the saferoom as their health slowly ticks away as soon as they leave the saferoom. There are no health kits or defribillators, so the Survivors must use pills and adrenaline to survive.
- Chainsaw Massacre
- The Survivors are given chainsaws with unlimited fuel. No other weapons are available.
- Last Gnome on Earth
- Gnome Chompski spawns in the saferoom and the Survivors must take him to the end of the campaign. The Infected will only attack the Survivor with the gnome.
- VIP Target
- Similar to Last Gnome on Earth, however, both the Infected and Survivor teams are controlled by players.
- Follow the Liter
- Similar to Scavenge, but only one gas tank will spawn in the world at a time.
- Versus Survival
- Similar to Survival, but both the Infected and Survivor teams are controlled by players.
- Gib Fest
- Like Chainsaw Massacre, but instead of chainsaws, all Survivors are given M60s and magnums with unlimited ammunition.
- Hard Eight
- Survivors are pitted against up to 8 infected at a time, instead of the typical 4.
- Max Specials
- A game of survival with absolutely no limits on how many Special Infected can spawn.
- First Man Out
- If one Survivor dies, the whole campaign is lost.
- Room for One
- There is only one spot available on the rescue vehicle, so Survivors must help and hinder each other in order to be the last one alive.
- Healthpackalypse
- Versus mode, only all health items are removed from the game.
- Ironman
- Once a Survivor dies, they are dead and cannot respawn. Anywhere.
- The Four Swordsmen
- All survivors are given katanas, and no other weapons are available.
- Boom Headshot!
- Only headshots can kill Infected. However, it is a one-shot, one-kill.
- Ultra Realism
- A combonation of Ironman and Realism. The rules of Realism apply, however, if a Survivor dies, it’s permanent.
- Last Man on Earth
- A typical Campaign, but with only one Survivor. Only Special Infected can spawn.
- The Last Samurai
- Similar to Last Man on Earth, except the Survivor is given a katana with no other weapons, and must fight waves and waves and waves of Infected
- Realism Scavenge
- The aspects of Realism combined with Scavenge.
- Versus Co-op
- A campaign game with a twist. The Survivors are AI and players are the Special Infected.
- Madness
- No Special Infected will spawn, but all common infected are more powerful, faster, more clever, and the chance of random panic events will occur more often.
http://en.wikipedia.org/wiki/Left_4_Dead_2#The_Passing
Some of those sound really good!
Nice. I really like the look of ‘Follow the Liter’, ‘Versus Survival’, ‘Boom Headshot!’ and ‘Versus Co-op’. ‘Last Man on Earth’ sounds super hard!
Follow the liter mutation is up! It’s scavenge, one can at a time. Who’s up for a bash tonight. Who *isn’t* ??