Left 4 Dead 3, and what happened to the l4d2 survivors
For those who managed to finish the left 4 dead 2 campaigns would know that they were last seen escaping on a plane, but we don't know what happens after that.Valve should make another comic to explain what happened, plus add a new campaign.
As for Left 4 Dead 3, i believe that it should be that another group of survivors, who are in fact immune and not carriers. These survivors would either try to be escaping to an uninfected zone or a safe zone. The survivors would consist of a Gamer, a Doctor, an Officer, and a CEDA employee. Also the special infected mutate to greater extents, along with a few new special infected. Here is what i believe the special infected will have mutated:
Tank- It will become taller, limiting it to outdoors or tall rooms
Witch- It will become an ambusher, along with a male version (it could be called a Slasher or something)
Boomer- can cause damage when they explode
Charger- Able to change direction when charging, but only slightly
Jockey-able to lead survivors faster away
Spitter-can create a "spit bomb"
Smoker-create a smokescreen to escape
Hunter-becomes silent when crouching
The new special infected:
The Slasher-male version of a witch
The Mauler- An infected dog or wolf, bites and latches on
The Titan-The campaign boss, stronger than a tank, but slower than any other infected