The Survivors:

Coach is a high-school football coach and is used to leading teams.
Rochelle is a women reporter for a local cable company and is producing a segment on the "strange" occurring in Savannah.
Ellis is a boy mechanic who has a smart mind and is said to have a "Southern Flair"
Nick is a gambler and conman who is unsure of his company and cynical about the events happening.

The Campaigns:

The Parish
Swamp Fever
Hard Rain
Dark Carnival
Dead Center

The weapons:

Melee Weapons:

Frying Pan
Baseball Bat
Axe
Cricket Bat
Katana
Crowbar
Police baton
Electric Guitar
Machete
Chainsaw

Firearms: (More are known)

AK-47
Glock
Desert Eagle
Grenade Launcher
Auto-Sniper
Pump-Shotgun
Silenced SMG
Automatic Shotgun
M16
P220
FN-SCAR

Supplies:

Health kits
Ammo packs
Adrenaline
Defibrillator
Pills

Explosives:

Molotov
Pipe bomb
Gas cans
Propane tanks
Bile bomb

Special Ammo:

Incendiary Ammo

Special Infected:

The Charger
The Charger "charges" the survivors forcing them to disperse should they be huddled together. The Mutant can hit multiple survivors with one blow and can also slam a survivor multiple times to the ground until a teammate kills the Charger. (The main goal of the Charger is to prevent players from camping in boxed areas)

The Spitter
The female Spitter has an area attack that can split up the survivors or flush them out of their hiding spots

The Jockey:
The Jockey is a small special infected who can jump on a survivors back and essentially steer a player to its desired direction causing a "breakup" in the team.

Uncommon/Common Infected :

Hazmat:
The Hazmat is a Uncommon Infected and cannot be set on fire, Molotov's will not be of any use. In order to kill them one must shoot it with a primary weapon or by using melee
weapons.

Mudmen:
The Mudmen are Infected that only appear in swampy areas. They cant be killed by Molotovs. They walk on all 4's like a dog and come from the water so you cant see them until it's too late.

Riot Infected:
The Riot Infected can only be killed from behind which forces players to move further away from each other making them more vunerable to other threats.

Infected Clowns:
The Infected clowns have bells on their shoes which attracts more Infected. Who wouldn't be scared of a "Zombie Clown"?

o btw,if anyone saw the l4d2 trailer,the big thing isn't a new tank,but the charger.