Steven Moffat has promised there will be “whopper” of a cliffhanger towards the end of the “next series”, one that he doesn’t think fans will see coming.

In the latest issue of DWM (#475) Moffat is asked how far in advance he plans, he replies: “One season at a time, largely. I suppose, I had a fair amount of Trenzalore worked out (the Doctor trapped in a war for a thousand years) when I wrote The Eleventh Hour, but that’s really the exception.”

And the key part: “Sitting here, right now, just before the finale shooting block, I’ve figured out the cliffhanger to the penultimate episode of the next series. And it’s a whopper. Ohh, I don’t think you’ll see this coming!”