In a move reminiscent of Dick Cheney, Moffat is going to reveal that after a long search, he has decided to cast himself as the Doctor.
We don't know that for sure yet. And with the British government cover-up of the Silurian infiltration, who knows if we will ever know. Though I guess the skin would be a giveaway.
I know... im saying it will amount to nothing more than "oh yeah, i finally watched the show" or something, just to get people riled up.