They MIGHT make Bran and Jon Snow have another near miss, like "Oh, Bran? Broken kid? He left yesterday." or whatever. I can't believe that the writers would smash Jon and Bran together now because it would be a huuuge difference from the existing story arc. On the other hand, I'm excited to be proven wrong. Edge of my seat and ****.
I think the scene with the White Walkers is totally ok, and would have been revealed eventually anyway (in both the books and the shows). It's like a teaser of nastiness to come.
Looks like Locke is a planted assassin, but we'll see. Also, Strong Belwas.