how close is what we see of Bran on the show to the Bran in the book. I mean at this point I have no idea what purpose he serves, if he speaks "in code" to humans, can't effect the future, and has to be careful about how he interacts with the past.

also for folks who keep talking about Martin's final book and what not, remember he told the show runners what he has and wants for the end. They just aint making it up