Valve has revealed the next batch of downloadable content coming to Left 4 Dead 2. There's something old - a new campaign called "Cold Stream" - and something new - maps from the original Left 4 Dead - coming for owners of Left 4 Dead 2.
The official Left 4 Dead blog writes that the three remaining campaigns from the first game, Blood Harvest, Dead Air and Death Toll, will be released as part of a map pack for Left 4 Dead 2. Presumably, that will come with balance changes, bug fixes and whatever else it takes to make those levels mesh with Left 4 Dead 2's style of gameplay.
Additionally, the community-made campaign "Cold Stream" will also come to the PC, Xbox 360 and Mac. Expect it to be story-free, which Valve says makes it possible to deliver these things faster.
No date, no pricing announced yet. But if you're looking for a little more detail, read on.
Cold Stream [Left 4 Dead Blog]