Valve details Left 4 Dead update coming next week
Valve has announced that Left 4 Dead is getting an update next week.
One thing to expect is the release of the Authoring tools/SDK, which has had a few additions and updates added since the beta.
Also, the matchmaking system will now support custom add-on campaigns, and content authors will be able to package up their new maps, along with posters, models, and textures, into a single .VPK file.
More over on the Left 4 Dead Blog.