Duke Nukem Forever level overview and more screenshots leaked

Lots of information and screenshots of Duke Nukem Forever were leaked yesterday. You can find dozens of screenshots at NoFrag, and if that's not enough the site also got its hands on charts that outline the plot of Duke Nukem Forever. You can check out the slides over here, they are dated July 2008. Here's a snippet about a Death Valley Monster Truck Race level:

Filename : Map10.dnf
Size : Large
Setting : High Noon Hot

Level Summary
Description
Responding to orders Duke heads to Hoover Dam in an EDF Drop Ship to investigate a wormhole in the sky which is believed to be a portal from the Alien world. The Dam top is overrun with Alien forces so Duke is dropped off nearby and must drive his monster truck with a mounted missile launcher to make his way to the to the Dam.

Game Play Elements
Enemies
Attack ships: Chase Duke, destroy the environment can be shot down with several missile hits
Alien Drop ships: Deliver alien troops can be shot down with several missile hits
Recon Bikes: Chase Duke can be run over with the truck or shot with missiles
Pigcops: Can be run over with the truck or shot with missiles
Assault Troopers: Can be run over with the truck or shot with missiles
Assault Commanders: Destroy the environment. Can be shot down with several missile hits
Giant Battle lord: Rises from lake mead at the Dam top can only be destroyed using Nukes
Pigcops in vehicles: Ramming into the player and firing weapons

Destructible Items
Small old wooden buildings: Out houses, tool sheds, cabins, mining sheds, old general stores etc. Can be smashed with truck or shot down with 1 missile hit
Wooden Fences: Can be smashed with truck or shot down with 1 missile hit
Wooden Road Blocks: Can be smashed with truck or shot down with 1 missile hit
Wooden Pillars: Legs/Supports from bridges, railroad bridges, water towers, guard towers and piers. Break from running over them or 1 missile hit
Signs: Billboards, road signs etc can be smashed with truck or shot down with 1 missile hit
Jersey Barriers: Temporary highway dividers can be smashed with truck or shot with 1 missile
Cactus, Joshua Trees: Can be smashed with truck or shot down with 1 missile hit

Puzzles and Stops
Gas Cans: Run out of gas and solve navigation and physics puzzles locating gas cans
Bridge: Locate and learn about gas cans acquiring a gas can in a small bridge guard building jumping through the skylight
Mining Camp: Remove weight from an ore cart to push it up a hill. Use track switches to route the cart to the correct track and push it through a destructible barrier acquiring a gas can. Perhaps the player has to mount it and ride it over a broken track death pit.
Another idea is to remove weight from a lift to solve a counterweight puzzle acquiring a gas can using David's old map07b counterweight puzzle
Monster Truck Rally: Strength tap open a garage door and break shelving boards to acquire a gas can
Wooden Pillars: Destroy legs from bridges, water towers and piers creating ramps

Explosive Items
Vehicles: All vehicles cars, sedans, vans, trucks and buses explode but the bodies remain
Red and yellow Barrels: Existing Red and yellow explosive barrels
Propane Tanks: Existing red propane tanks
Industrial Gas Tanks: Elevated industrial gas tanks used in farms and rural areas
Gas Trucks: Explode completely clearing the path for really large explosion events

Moveable Items
Cars: compacts and sedans can be pushed out of the way or go flying when struck with enough force. Have the same properties as exploding cars. Will blow up with 1 missile hit
Small Boulders: Can be pushed or hit out of the way or go flying when hit with a missile

Barriers
Cliffside Drop offs: The natural gorges will kill the player if he drives or jumps off
Steep Rock walls: Steep high rock wall inclines of 60 degrees or greater
Metal Fences: Metal reinforced fences cannot be moved or destroyed
Metal Buildings: Metal reinforced buildings cannot be moved or destroyed
Highway concrete dividers: Permanent highway dividers cannot be moved or destroyed
Highway Metal Railings: Permanent highway railings cannot be moved or destroyed
Large Vehicles: Vans, semi trucks and buses cannot be moved but explode the bodies remain

Walk Through
Intro Drop off
Arrive at Hoover Dam and Drive the Monster Truck with a mounted missile launcher out of the EDF Drop Ship
Explore while learning to Drive
Bash through and crush a variety of enemies, vehicles and obstacles on a highway traffic jam gauntlet while avoiding civilians

Bridge Stop
Run out of gas at bridge locate nearby gas can to progress
Preview wormhole with Attack Ships coming out of it
Drive across collapsing bridge as Alien Attack Ships destroy it

Canyon Gauntlet 1
Smash through, run over and shoot down a variety of enemies and wooden obstacles on and off road while being pursued by Attack Ships
Shoot down Alien Attack Ships with Truck turret
Use the turret to Blow up an exit barrier to progress

Mining Camp Stop
Run out of Gas at an abandoned mining camp
Explore mining camp on foot solving a navigation/physics puzzle to acquire a Gas can Fight through an ambush to get back to truck
Break wooden leg supports on a bridge creating a ramp to progress

Ghost Town Gauntlet 2
Smash through, run over and shoot down a variety of enemies and wooden obstacles on and off road while driving through a ghost town
Have an old west shootout with a pistol wielding Pigcop
Use the turret to Blow up an exit barrier to progress

Monster Truck Rally Stop
Run out of Gas at an a desert Monster Truck speedway
Find gas can in garage solving navigation puzzle
Return to truck with Gas can as Assault Commander turns other drivers into Pigcops
Race against Pigcops that attempt to run over and shoot the player on a Monster Truck Track
Jump into the final arena and win a demolition derby against Pigcop drivers
NPC opens exit gate
Cliffside Gauntlet 3
Drive across a treacherous Cliffside canyon road as Alien Attack Ships attack causing avalanches and destroying bridges in your path
Make one last big jump landing in Lake Mead dismounting from Truck

Arrival at the Dam
Swim to an intake tower finding an access ladder
Reaching the Dam top a Giant Battlelord bursts out from Lake Mead
Use 3 Nukes to destroy the Battlelord who collapses on an intake tower
Rappel down the face of the Dam and smash through a vent to exit.>