Supernatural question

Hey, SPN fen-- or maybe I should say RHPS fen. Tell me if I'm wrong or right here- I'm having an argument with the kidunit about someone we see in the preview for next week's ep, "The Curious Case of Dean Winchester." That is ( slight spoiler behind the cut )

isn't it?

In case you want to see for yourself, here's a blurry Youtube copy of the preview because there isn't an official one up yet: http://www.youtube.com/watch?v=HST0jF2ldrM