Originally Posted by Lyramion

Was a better solution More tactical and fun to be "that" melee guy

I agree. I was a bit disappointed when I first noticed how the melee pickup works. Glad they 'fixed' it to the current system.

Originally Posted by Celestial1

You know, in regards to melee, I just realized something; I've never heard a mention of the chainsaw being in the game. It's in the teaser trailer, but I've yet to see it in footage or been said that it was in. Any info on that?

There isn't any ingame footage, but it's coming. Chet said that it's one of the first melee weapons they came up with and said it's a must.
I'm sure it's reason of it being harder to import into the game as it's not your traditional melee weapon but actually need brand new code instead of using modified crowbar code.

Originally Posted by Morganan

I just wanted to point out, that garage door that is sometimes open..

It automatically opens when you activate the lift to start the event, if it's open before that, it's due to a boomer-horde being spawned in there. That door has an entity tied to it to open with the event and it is also set to only be "broken" open by common infected and does not allow it to be "passed through" by ghost SI. The nav file extends into the garage so the director can choose to place infected in there but they will basically do nothing unless boomer-bile attracts them. (Ya, I decompiled this map awhile back to see why my no-meds tweak seemed to never remove the medpack at the end of nm-3, so if you do the same I guarantee you will see the same thing)

The only "dynamic changes" in L$D1 are pickup-item spawn locations or if you are playing on a server with a specific SM mod installed which allows an admin to spawn or de-spawn certain prop's at his whim. Ydiss tweaked a mod to make some of the maps more competitive using this method without forcing clients to download a new version of the map.

I see. I had just noticed that sometimes it's open and sometimes it is not and I think I've found items in there.

Originally Posted by Morganan

As for dynamic pathing, they still haven't released much information as to the nuts and bolts of how this would occur. The "never play the same way twice" most likely has more to do with the gameplay then the pathing differences. I'm guessing they are going to go with a few pre-designated paths the AID can choose from as technically that's far easier to pull off then allowing the director to control essentially map generation in certain sections of maps. I could be wrong, they have stated publicy very little information about the technical side of the dynamic pathing so it really is up to us to guess at this point how that is going to occur.

They have said that AID2 can change the layout of the maps and control weather depending on how well your team is doing.
They've also released those 3 pictures (which I posted as one small, because I couldn't be bothered with uploading all three of them) showing how it may choose the route. These are all of course pre-designated - I couldn't imagine them putting so much code and work on the AID that could be done with few more simple entities in the level.

Here's a good read on what we know so far:

Originally Posted by http://www.zombicidal.com/

The original AI Director was a heuristic script that changed item/Infected spawn locations and music to vary the intensity of the game. In Left 4 Dead 2, the new-and-improved AI Director 2.0 will have even more control. In addition to spawning and music, the AID2 will be able to control weather conditions and even the physical layout of some parts of the map. By rearranging obstacles, it can make effecting escape more difficult for Survivors doing well and easier for Survivors on the Xbox. Zing!

Currently, the obstacles/locations we know the AID can rearrange are the hedges in the garden maze (Jackson Square in The Parish 2), the crypts of the cemetery, the cars in the impound lot, and the cars and bombing holes in The Parish finale. In Swamp Fever, the AID can control which areas of boardwalk will break underfoot. We don’t know if the AID picks from pre-fabricated routes or if it has a pseudorandom algorithm for arranging them. Example of the different paths the Director can choose are shown below.

The AID2 can also control weather and other effects to completely customize the experience. This is especially true for the third campaign, which takes place in a marsh-like area. A lot of the map will be relatively open, so to make things more difficult, the Director can suddenly bring a harsh downpour that severely limits visibility, making it almost impossible to spot Infected and even teammates. Outlines won’t appear in the rain. According to Chet, “We’re giving it control over the weather now. Now you go from [a sunny day] to holy crap man, I can’t see anyone around me. It’s like the Blood Harvest cornfield, right.”

Originally Posted by Mech__Warrior

I wonder if there will be more types of ammo than just incendiary. In one of the trailers, the shot reduced your health and blurred your vision, like when you almost die.

Yes. There's the normal type of ammo, incendiary - that sets infected on fire (except the hazmat infected, that is immune to fire) and explosive ammo that explodes on hit and knocks infected back.
The special ammo lasts only one clip and is lost if you reload. Sure you can pick up more though after you've shot one clip.