It does include DLC, full list of content:
http://blog.eu.playstation.com/2010/...ion-is-coming/It will include the following bonus content on the disk:
* The Taxidermist playable scene
* 3 x dynamic XMB themes for your PS3
* Full game stereo soundtrack
* Making Of videos: There are 9 Making Of videos totaling in around 45 minutes in length. They feature a behind the scenes insight into the game’s development with interviews from the development team and the game’s cast. If you’re a Heavy Rain fan, they’re not to be missed!