I watched the whole series 1-5 with the gf; surprisingly good show! Most interesting take on the unknown/heaven & hell I've seen yet.
She sent me this bit of a spoiler from an interview with Jensen Ackles (Dean) for next season, which sounds like it's already been green lit-
Dean: I’m excited about next season because we’re pushing the “restart” button.
Interviewer: How come? By the way, how is possible to continue after getting the Apocalypse done?
Dean: For the creative aspect, we need to understand we just got over a gigantic climax and we’re getting into an unknown territory. The Apocalypse was avoided. That’s why we getting forward a few years and see where the Winchesters are and how it’s their lives. I can’t help, but think of the final scene of “The Hurt Locker” (2009 Oscar winner), when the main character sees himself in front of a shelf with several cereal boxes and doesn’t know what to do. The guy disarms bombs in Iraq, but gets lost on the supermarket! That is not his reality, just like not being a hunter looks like a different world to Dean. All his life was dedicated to one single task, almost like a voluntary slavery, now it’s time to face the monster of real world. That’s totally new to me, through the acting perspective, and I’ll explore a lot more of Dean’s life, that’s why I’m so excited. A kind of introspective tension, like inside monsters.
Also a description of Season 6:
"Supernatural" - Season Six will be a season of mystery and shadow. Heaven and Hell have been left in complete disarray since the apocalyptic events of Season Five. Now monsters, angels, and demons roam across a lawless and chaotic landscape. And so Dean Winchester, who has retired from hunting and sworn never to return, finds himself being pulled back into his old life – pulled back by none other than Sam Winchester, who has escaped from Hell. The two reunite to beat back the rising tide of creatures and demon-spawn, but they quickly realize that neither are who they used to be, their relationship isn’t what it used to be, and nothing is what it seems.