Now, something to go back into your Doctor Who archives and check out:
In the two-part "The End of Time" special that saw David Tennant's Tenth Doctor regenerate into the Eleventh (played by Matt Smith), we see Gallifrey on the last day of the Time War. And in the council, one of the Time Lords tells Rassilon (played by Timothy Dalton) that The Doctor has "the Moment".
Watch that trailer again. Listen to the words. And look at what John Hurt's "missing Doctor" is poised to use.
Could it be that Steven Moffat was planting the seeds for the fiftieth anniversary special four years ago, right in front of our very eyes? Could it be that John Hurt's Doctor is the one always intended to be the one that so terrified the Time Lords?
"The Day of the Doctor" broadcasts simultaneously beginning at 7:50 British time on November 23rd. Thanks to Drew McOmber for the heads-up on the trailer!
UPDATE 3:54 p.m. EST 11/09/2013: Bad news: the BBC yanked the above leaked video.
Good news: the BBC finally posted it officially!