Martin infamously has taken years to finalize the sixth book in his series, with no end date in sight as of yet. Since the show has already shifted from the details of the books, Martin is as clueless as the rest of us plebs -- and admitted that he wishes it had gone differently.
"It’s been an incredible ride. And almost all of it has been great. Obviously, I wished I finished these books sooner so the show hadn’t gotten ahead of me. I never anticipated that," he said. "I haven’t read the [final season] scripts and haven’t been able to visit the set because I’ve been working on 'Winds of Winter.'"
He also confirmed that he doesn’t make a cameo in the final season -- turns out not writing a book doesn't leave much time for small-time acting.