Supernatural Flashback!

This is part of the casting call for Episode 4x13. Looks like we're getting that flashback!

[YOUNG DEAN]
18 years old. Must look like a younger version of Jensen Ackles.

Source: SpoilerTV

Old scoop about the flashback:

"Coming up in the middle of the season, there's an episode titled 'Afterschool Special' in which the boys investigate a haunting at one of the high schools they attended as kids," exec producer Eric Kripke tells me. "As they investigate, we'll see flashbacks to what high school was like for Sam and Dean." Sounds fun, right? It won't be. Adds Kripke: "It wasn't pretty."

Source: The Ausiello Files