Update:
Full details about the DVD from the Warners Bros Shop.
Special Features:
Portrait of a Serial Killer – Red John (featurette)
Red Moon: Directed by Simon Baker (featurette)
Lost Evidence: Unaired Scenes

Artwork for Season 3 DVD (USA - Release Date 20th September)

 

Lovely photo, but looks like no Gag Reel again - grrrr!