User blog comment:MasterCharmander13/This makes me curious/@comment-27270572-20150817135120

Not sure he has been writing it for 10 years, they just stated that they could not have written it ten years ago and despite numerous rewrites I doubt it was 10 years to write one episode when he has written so many inbetween. I do not think the episode will address the Capaldi face conundrum. Episode 12 filming shots are here:

twitter.com/DWFilming

They seem very curios indeed.