He writes some episodes each season, though he's not in full control. He did tell the showrunners how the story ends though.

Do you have links with that info? Reading that stuff would be great.

http://gameofthrones.wikia.com/wiki/George_R.R._Martin

"Martin is credited on the Game of Thrones TV series as a producer and consultant. He has written the scripts for the eighth episode of the first season, the ninth episode of the second season, seventh episode of the third season and the second episode of the fourth season.^[1] It was originally planned that he would write one episode per season of the show. However, he stated in an interview that he won't write an episode for Season 5 in order to finish the next installment of A Song of Ice and Fire.^[2]"

http://www.huffingtonpost.com/2015/03/23/game-of-thrones-ending-books_n_6922748.html

Sorry book readers, but "Game of Thrones" creators D.B. Weiss and David Benioff are going to deliver the spoiler of all spoilers.

The two showrunners for the HBO series are some of the few people who know the ending to George R.R. Martin's still unfinished A Song of Ice and Fire book series, which "Game of Thrones" is based on. Last year, they revealed to Vanity Fair that the author explained the ending for "every character" in Westeros.

Thank you sir. :) Seems like for once the roles reversed and the TV Series brought the firsthand info and spoilers. I wonder though if the writers will use that info Martin shared. It makes sense for them to use it but who knows?

its stupidly obvious that he isnt dead and as for the whole season ....it sucked monkey ass.

The show has caught up to the books.

Happy waiting.