"All thirteen of him." Erm, those were his eyes, weren't they? And a few flashbacks and what sounded like some newly recorded lines...
"I don't want to go!" You bastard, Moffat, don't make me cry.
The Curator. No, I said don't! Was he actually, well, y'know, him?
That final shot and the end credits - OMG FANGASM SQUEE CAPSLOCK MELTDOWN ASDFG
Loads of action, nice epic feel, some great intimate stuff, good use of humour (including more fannish in jokes than you could comfortably shake a stick at), well acted throughout. And great to see the Zygons back. Pity their plot was kind of left hanging, or that's the way it seemed.
Want to watch it again (probably a couple of times) but for now, a definite 10 out of 10.