I was just thinking about this idea and i want to see what you all think of it. If enough like it (and are willing to help) We may be able to get it going.
The idea comes from the concept of left for dead. To have a re-playable campaign that hardly ever gets old. now Left 4 dead did this nicely however Its still going from point A to point B on a map that doesn't change.
The idea. Escape from (name to be determined) city. A campaign of about 10-15 maps that instead of going in a straight line go more like the area of a city. Where each map is a part of the city. There are multiple entrances and exits for each map all leading from/to different maps.
Instead of having a single goal(escape) There are multiple goals, such as defend a group of survivors. Defeat a smoker "nest", escape a tank herd. All of these secondary goals help the team access special area and extras. Basically trying to show whats really happening to the city and its citizens as the city turns to chaos.
One thing I was hoping to add in is carry on info between maps, where if the survivors complete an objective in one map it can help out in another. Such as a bunch of military survivors have been held up in a store with a cache of Gatling guns. If the survivors can defend them through finale level panic attack. they will place Gatling guns thought the map and nearby maps.
The Primary mission would be very hard to complete(something to brag about) and require the group to go across the city to get various things and finally survive the mother of all finales.
suffice to say this is one big task I'm thinking up, much for than what I can do myself, (well without finishing after l4d 2 comes out. ^_^) Anyways that's the idea, feel free to give your suggestions on it.