Hey, hey got some more info on that scene.
Spoiler
Show
It's the opening scene. And the Doctor's in it as an old soothsayer for Churchill.
My reaction to this news:
. Moffat is up to his old tricks again. Not explaining. You've probably all put me on your ignore lists but by tomorrow I think you'll all be agreeing with me, whatever score I give it (which will be low). If not, half of you will agree with me (I can name that half but I won't).
In lighter news, Doctor Who is immediately followed by Merlin. Who here watches Merlin? Because that's good too.