I don't like the fact that they've removed a character from Bran's storyline, that was referred to as Coldhands. mysterious, doesn't say anything, has black, cold hands (hense the name) as if he were dead. They meet him, I think at Craster's Keep (which is already abandoned), and he helps guide them the rest of the way North.
I have a theory that it's Bran's uncle Benjen, the Night's Watch ranger that goes missing in the first book. That the white walkers tried to turn him into one of them but didn't quite manage it.