Hannah's Back! Hooray!
Except that it was only at the very end of the episode, so I guess...Hannah's back next week! Hooray!
I'm curious, since I don't watch those "Next time on Dexter..."s - did they give the Hannah reveal away last week? Because those tags have given away episode endings before. I can't imagine the powers-that-be being able to restrain themselves when they had such a juicy morsel to tease people with, even if it spoiled the very last scene.