Doctor Who 50th Anniversary Zone is reporting this synopsis of the 50th anniversary (look away now if you don’t want to know!)
‘The Doctor and Clara are still trapped in the Doctor’s timeline. The only way to escape is through a doorway hidden at the Citadel on Gallifrey….
The Doctor breaks the lock concealing the Time War and recruits the help of his Tenth incarnation, Rose Tyler and ‘The Other Doctor’ (Played by john Hurt) to help navigate through the horror of the war.’
They’re saying it’s from a “new source” that has been “right on several occasions” but has not been verified (as if you can verify rumors!).