My call is that they are going to merge Bloodraven and Coldhands into one character and have him swoop in and rescue Bran et al.
I honestly have no idea, the show has diverged so far from the books, its tough how to see them right the ship without some kind of dramatic swooping in scene. Otherwise, they do meet, Vargo Hoat v.2 tries to kill Bran, Jon intervenes, and the two agree that it won't be safe South of the wall with the Bolton's trying to kill him (which will be stupid)
I think we're going to see more of these departures as GRRM continues to not write books and the show continues on. They still have 60% of the season left and like 15% of the 3rd book left for it. So they either need to: slow the show down considerably, start picking off story lines to advance beyond SoS, creating new content between the lines to fluff up the story.
I like some of the stuff they are doing with the later approach... flushing out more of Margaery's character has been interesting but then they go and gloss over scenes like Jon finding out his brother yet lives and the interaction between Dantos and Sansa. It is a good shout out to the book readers to start sprinkling in new revels that couldn't have been in the book due to the POV format, but it does seem like if they are hurting for content they could quit cutting things from the book out of the show