The White Walker narrative seems a little slipshod at this point, hopefully we get a fuller explanation in the show. Have a feeling in the books, the relationship between the Greenseers/children of the forest/ people of the North will be more complex. And as I mentioned before, I'm fairly certain the simplified narrative of "dragons good, white walkers bad" reinforced by the show so far will turn out to be wrong.
Speaking of things we've talked about before; Sansa is turning into badass feminist revenge seeker sooner than even I anticipated. Told ya Rex
As for Meera and Bran, I have a feeling that a character who has gone missing (and hasn't appeared since Season 1 in the show) will reappear and give them some help. Edit: what Pepe said, but the former rather than the latter.