The BBC have confirmed that "Heaven Sent" will air on Saturday 28 November 2015 at 8.05pm - and the episode will end at 9pm, giving us a 55 minute running time. "Face the Raven" which airs on Saturday 21 November 2015 at 8.10pm has a 50 minute running time. The full size version of the new promo image above for "Heaven Sent" is in the Who-Natic Gallery.
The synopsis for "Heaven Sent" is:
Trapped in a world unlike any other he has seen, the Doctor faces the greatest challenge of his many lives. One final test. And he must face it alone.
Pursued by the fearsome creature known only as the Veil, he must attempt the impossible. If he makes it through, Gallifrey is waiting…