Spoilers alert on all links!
SpoilerTV has the Supernatural panel. Thanks to Comic Con Live for the link.
Super Wiki has panel coverages over here.
Maureen Ryan of Chicago Tribune, who moderated the panel, posted a Comic Con roundup.
iFMagazine talked with Supernatural cast and crew about the upcoming season. Thanks to Peter Brown for the information.
E! Online has interviews with Eric Kripke, Ben Edlund and Sera Gamble.
Panel covers are also on Cinemaspy.com, The CW Source, HitFix.
Additional source: Comic Con Live, Supernatural Wiki.