The idea that he really is this angel, and that he's so powerful that all the demons are just freakin' out like that one "game over, man!" demon that Sam sent back to Hell... that would be a really boring season.
Why did she pretend not to recognize Dean and Bobby when they showed up? Is she sleeping with Sam?
What exactly is her agenda here?
Lots of potential for totally screwing over the Winchesters before it's sorted out.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.