DigitalBits dixit:

Our ever reliable industry sources are telling us that Universal will soon announce the DVD release of Joss Whedon's Serenity for 12/20. Early word indicates that the disc may include Whedon audio commentary, along with at least 4 behind-the-scenes featurettes (Future History, We'll Have a Fruity Oaty Good Time, Re-Lighting the Firefly and What's in a Firefly), a video introduction to the film by Whedon and 6 minutes worth of outtakes. Some of the details on the extras comes from the BBFC website.