The Brothers Winchester will return to my television on September 10th to pick up their fight against evil where they left off last May.
Looks to me like Sam is still battling his inner demons (that's a metaphor of course, to my knowledge he hasn't been possessed again since getting that possession blocking tattoo) and what I can only assume from her outfit is an outer demon as well.
And I believe she may have gotten her brainwashy hooks into my dear, sweet Bobby because what else could be the explanation for my favorite non-ironic trucker-hat-wearing demon hunter to hold a knife to Dean's remarkably pretty face?
Shit is goin' DOWN this season, bitches! Woo!
Ahem. Sorry, I've composed myself now.