Steven Moffat revealed to Doctor Who Magazine that fans will "gasp" in amazement when the "true nature" of their friendship is revealed in a mysterious new storyline due to air next year. He said:
"You'll see The Doctor's life change forever. You will gasp at the true nature of his relationship with Amy and cry out in horror as Rory stumbles to the brink of a tragic mistake. It is an enormous, game-changing cliffhanger for The Doctor, Amy and Rory. It'll change everything for them."