This probably isn't a big shocker, since DJ Qualls has already been brought back, but both Zap2It and TV Line are reporting that Felicia Day, aka Charlie Bradbury from season seven's "The Girl and the Dungeons and Dragons Tattoo," is making a return for episode 11, "LARP and The Real Girl."  More info about the episode (LARPing with a different twist) can be read at the links below:

TV Line:  http://tvline.com/2012/10/31/supernatural-season-8-spoilers-cast-felicia-day-charlie-return/

Zap2It:  http://blog.zap2it.com/frominsidethebox/2012/10/felicia-day-returns-to-supernatural-in-larp-and-the-real-girl.html