The EW Spoiler Room has some info from Jensen Ackles regarding what’s next for Dean.
Read it:
I need Supernatural scoop. How did Dean’s time as a demon change him? — Carl
“Right now, it’s less about how he was and what he was, and it’s more about what he might possibly still be,” Jensen Ackles tells me. “He’s still got the mark of Cain so he’s still dealing with whatever adverse effects that’s having on him. What those are have yet to be really defined, but it’s the mystery of what those could be that is really haunting Dean right now. He’s got the shakes. He’s trying to live a cleaner life. He doesn’t want to let does his guard or cloud his judgement.”
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