Season 7 has to be Book 7 since Book 7 will be huge.
Season 6 has to be Book 6 since Book 6 will be huge.
Season 5 has to be Book 4 & 5 since GRRM wrote those two books in a special way for those who read the series which allows for one super condensed season.
My point is that is a lot to cover in 30 episodes.
GRRM is consulted, but those two dudes can do whatever the fuck they want to. And GRRM didn't reveal the whole ending to them, just confirmed some things to them.
HBO already said that they would keep GOT going as long as possible. The reality is that everyone knows that the show will catch up to the books and then shit will be fucked. I seriously doubt that GRRM will pump out two books in 3 years. That shit is not happening. We'll be lucky if dude puts out Book 6 in the next 3 years.![]()
Season 4 will have elements of book 3,4,5 in it.
From what I've witness in the trailers, a lot of book 5 is going to take place in this season.