Here we have a mini-episode of Doctor Who, titled The Night of the Doctor. It is a prequel to the 50th anniversary special, which is titled The Day of the Doctor. The Day of the Doctor will air on BBC channels on November 23, 2013 and will be available on Blu-Ray on December 10, 2013.
This mini-episode features the eighth incarnation of The Doctor, played again by Paul McGann. It also features John Hurt as The War Doctor. What is The War Doctor, you say? Your guess is as good as mine, and I assume we will find out when The Day of the Doctor airs . . .
Take a look at the mini-episode here. It is pretty damned good . . .