spoilers from Kristin
Espy in Staten Island, N.Y.: Thanks for all the Supernatural scoop, but what about Castiel (Misha Collins)? Is he ever coming back?
I'm told we'll next see Castiel in March-ish. In other news, Lilith hijacks the body of a dental hygienist and returns to wreak havoc on the Winchesters in ep 18. Last but not least, you have to watch this sneak peek for Thursday's SPN, which flashes back to Sam and Dean in high school. That's a positively uncanny Jensen Ackles-as-Dean impression, if you ask me!
source: http://www.eonline.com/uberblog/watch_with_kristin/b80892_spoiler_chat_gossip_girl_couples_scoop.html