Last week, Valve announced the details of the eagerly awaited Left 4 Dead DLC. I think I can speak for most in saying that it was more than a wee bit disappointing since we will actually be seeing very few 'new' features. However, it has now been revealed that the content will in fact be free.
To make people a little happier maybe? We'll see.
Still no date, but we've been told we'll see the content in the spring.