General Spoilers

11/6/08 - I’m hearing that Supernatural is going to be dealing with a lot of specifically religious symbolism this season, with a particular eye toward the devil, hell, god, etc. (And with any luck: loincloths.) Also, did you hear that Sam is the devil's son?! Oh wait, wrong show. Did you hear that Dean is in hell?! Crazy town! From what I'm hearing, the new Supernatural season is looking really good.

Source: Kristin on E!Online

28/5/08 - [Eric Kripke says] "How Dean gets out of Hell becomes the primary concern for Season 4. He'll spend a long time there and he emerges to a different landscape. A lot has changed since he's been away, and he'll have to readjust to his loved ones. His relationshiop with Sam (Jared Padalecki) will be massively affected. We don't feel that Dean is going to be a demon but there will be an ongoing mystery. Just what happened to Dean in Hell? He has little recollection. Slowly and surely we'll unfold that story."

Source: Spoiler TV

24/5/08 - Lauren will not be coming back next year. [... In Season 4,] we're gonna spend a little less time talking about giant movements and war and more time talking about the brothers' relationship and how they react to that war. I think we sort of have a new species of supernatural being that we'll be introducing in season four that will take people by surprise. [...] In terms of Mary, we're definitely delving into all of that. I think my goal is to answer those questions sooner than people are expecting us to. I think in the first half of season four we'll actually answer a lot of those questions. [...] We have the Croatoan virus on our board of ongoing mythology, and it will return in some form or another that we're working on.

Episode 1 - "Lazarus Rising"

24/6/08 - Sides up for episode 4:01 - HERE

Casting: [ Kristy ] Female, 20s, sexy, snarky and adept at adjusting to any and every situation. Recurring 5 Episode Arc. [ Castiel ] Male, 30s or 40s, charismatic, calm and very good at getting people's attention. Recurring.

Source: Spoiler TV