MovieWeb has a clip from the upcoming Supernatural Season Four DVD, to be released on DVD and Blu-ray on September 1, 2009.
The DVD and Blu-ray will include:
* Season Four's 22 Episodes
* The Mythologies of Supernatural: From Heaven to Hell – Three sections featurette gallery bridging Heaven, Purgatory and Hell to examine key methological precepts
* Commentary on 3 Key Episodes by Executive Producers and writers
* Extended/Unaired scenes
* Gag Reel