Quantic Dream has been signaling Heavy Rain would have a life beyond the disc it ships on, and the first details on Heavy Rain's downloadable content have been released. The first episode of the Heavy Rain Chronicles, described as standalone short stories starring the characters from Heavy Rain, will be available on day one to gamers who pre-order a copy of Heavy Rain.
Heavy Rain: Chronicle One -- The Taxidermist is based on a scene that was used to demo the game, but was not part of the central storyline. The scene hasn't disappeared completely, however, as it's now been spun into downloadable content. Gamers who don't pre-order Heavy Rain will have a chance to purchase "The Taxidermist" for $4.99 sometime after release. A date hasn't been set.
At least two additional episodes have been announced, but it sounds likely there will be more.
Source: PlayStation Blog