About this show, I'm really waiting for the last book to come out so I could spoil the rest of the story for myself. Mind you, not by actually reading it, but by going through the abridged plot on the wikipedia. The series is moving too slowly. I really can't wait years to know what happens in the end.
Given the author's advanced age, weight, interest in other projects and slow writing style you might be waiting a while. He did tell the HBO creators the general outline of how he currently sees the story ending in case he passes on or the show catches up to the books.
"When the snows fall and the white winds blow, the lone wolf dies but the pack survives." Winter is Coming Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die. As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.
The series is moving too slowly. I really can't wait years to know what happens in the end. 
He did tell the HBO creators the general outline of how he currently sees the story ending in case he passes on or the show catches up to the books.