The Arya knockout was a cheap cliffhanger in the books, and would've been much harder to leave ambiguous in the show than in the books. Never expected them to try to fake us out.
I was expecting the last scene of the episode to be her running away from the camp (toward the camera) with the Stark bannermen all on fire (a neat detail they left out, with the oil soaked tents)... and then you see the Hound take a swipe at her with an axe before everything goes black.
I think we see the fires next episode. I really do not know how they will end things next week.
Having watched again, twice, I think it worked very well. Westeros.org is whining way too much about the episode because they are obsessed with minute details of Cat Stark's portrayal.
One quibble though: why show Ramsay flay Theon's finger and not have Roose give it to Robb as a present?