I'm assuming Hurt's Doctor will now have acquired canonical status. He'd better had. He was lovely. A sad, quiet Doctor.
Moffat has frequently disappointed me, but you can't accuse him of holding back or playing safe. He has written some of the best episodes in the show's history and last night's took its place among them. It went for broke. It was funny, brain-achingly clever, spectacular, silly and moving. It was great to have Tennant back. And Piper. And the unheralded, unexpected guest.