Turns out that amid all the wild, far-fetched fan theories about how Game of Thrones will end, one or two may have hit the nail right on the severed head. "So many readers were reading the books with so much attention that they were throwing up some theories and while some of those theories were amusing bulls — and creative — some of the theories are right," author George R.R. Martin confessed during a talk at the Edinburgh International Book Festival. "At least one or two readers had put together the extremely subtle and obscure clues that I'd planted in the books and came to the right solution."
Even though some readers have stolen his thunder, Martin says he doesn't plan to deviate from his planned ending:
I’ve wrestled with this issue, because I do want to surprise my readers. I hate predictable fiction as a reader, I don’t want to write predictable I wrestled with that issue and I came to the conclusion that changing it would be a disaster, because the clues were there. You can’t do that, so I’m just going to go ahead. Some of my readers who don’t read the boards, which thankfully there are hundreds of thousands of them, will still be surprised and other readers will say: “see, I said that four years ago, I’m smarter than you guys.”
But which of the many fan theories will prove correct? Whatever you do, don't ask Kit Harington (he knows nothing).