Have you guys seen the last trailer? Only Jon, Sansa, and Arya was there with Jon and Arya's sword pulled out, no sight of bran. People are speculating that bran is the Night King. 
Yea I have heard that too. Its actually a pretty good theory. They can even look alike in some pictures. Also heard some other stuff too from a supposed "script leak" that would involve Bran & Azor Ahai in the final season...Its almost here.......
