That actually wasn't revealed to the audience in Saturday's episode. It was revealed in a whispered aside by River Song, so we still don't know the Doctor's name. Wouldn't it be funny if it's John, or Fred or Henry? Something surprisingly ordinary.
But we did solve the riddle of the "impossible girl," but not until the last few minutes of the episode. "I was born to save the doctor," Clara starts. She's born, lives, and dies over, and over again. And she gets to save "Doctor," something that's a little bit mind-blowing of itself; the Doctor needs saving?! Who knew. This time was no different.
This episode started off with Clara psychically consulting with Trax, Madame Vastra, River Song, and Jenny through a communal dream. Madame Vastra had just met with a prisoner who told her that the Doctor's greatest secret has been revealed. The conference didn't get very far before the whisper men interrupted to tell River and Clara, 'killed' Jenny, and awakened Madame Vastra: "Tell the Doctor his friends are lost forever more unless he goes to Trenzalore."
When Clara tells the Doctor his reaction is unexpected. He sits on the sofa, and cries. Then he goes off to the Tardis' underbelly eventually programming the coordinates to Trenzalore. Trenzalore is... the location of the Doctor's grave site. The Doctor must never go there because he's crossing his own timeline- a big no-no for time travelers. Remember the first half's finale when Amy dies- she reveals her own grave stone and the doctor couldn't save her.
The TARDIS knows this and initially refuses to land of its own accord. The Doctor forced it to fall to the ground. The scene reminded me of something out of a Christmas Carol- the part where Ebeneezer Scrooge is with the ghost of Christmas future walking through a cemetery. The Doctor meanwhile sees the graves of his friends; River Song- ("River's not buried here," he says). River appears to Clara, and they have a little conversation; her grave is actually a tunnel to the Doctor's grave. Of course, The Doctor and Clara follow it. Clara remembers the "forgotten day (Journey to the Centre of the Tardis), and starts asking him about it. The Doctor lets slip the little detail River is his wife.
A vine-wrapped TARDIS interior is the stage for the final battle. Everyone's there looking at the Doctor's corpse; a blinding blue light made of frayed threads. Dr. Simeon (aka The Great Intelligence) announces: "The doctor's life is an open wound, and an open wound can be entered." There's nothing left to do following that statement but enter it, which, is exactly what he does. The Doctor falls to the ground writhing in pain; all of his good work is undone.
The stars begin going out, Jenny dies again;"The silence will fall, and darkness will reign..." I digress. Enter Clara who comes up with the idea of jumping into the time stream to save him. "The time winds will tear you apart," warns River. That explains why the Doctor keeps running into her; each version of her life will be lived to save him. Clara doesn't heed the warning of course, and jumps into the time stream anyway, and everything is set to rights. It's kind of the ultimate expression of love; living your life unconditionally to save just one person. "Run you clever boy, and remember.." were her last words.
The Doctor wakes up, has a little exchange with River which ends with her saying enigmatically: "Spoilers," when he asks her why she hasn't faded yet. Maybe season 8's mystery??
The Doctor enters his own time stream to save Clara. They meet up in a post-apocalyptic type of place, where John Hurt. "I didn't say he was "The Doctor," I said he was me," The Doctor informs Clara. And that's where it ends. I can just hear Clara asking John Hurt the next question: "What am I to call you?" Which is probably going to reveal to the audience The Doctor's name.
I think John Hurt's going to be some version of the Doctor. Perhaps the one who destroyed Gallifrey? It would fit with his seemingly world-weary attitude; lonely bitter, resigned to his fate. And Clara- still a mystery; is this the real Clara? and what happens when she crosses her own timelines?
I can't wait for November.
While we're waiting below is the trailer for the 50th anniversary special from BBC One.