From Mike Hirsch of the Morning Call, a small Pennsylvania newspaper that somehow landed this exclusive:
“'I know in Game of Thrones, the ending, they’re going to shoot multiple versions so that nobody really know what happens,' HBO’s Casey Bloys said. 'You have to do that on a long show. Because when you’re shooting something, people know. So they’re going to shoot multiple versions so that there’s no real definitive answer until the end.'”
The real twist: All the endings they shoot make it into the final episode, confusing everybody.