It has been confirmed Doctor Who’s finale episode will be extended.

This weekend on BBC One is the second to last episode in series 8, called ‘Dark Water’, where some of the secrets will be revealed about who Missy is.
November 8th at 8pm is the last episode in the series called ‘Death in Heaven’ will be extended to 60 minutes.
The last episode is directed Rachel Talalay and written by Steven Moffat.
The synopsis reads: “With Cybermen on the streets of London, old friends unite against old enemies and the Doctor takes to the air in a startling new role.
“Can the mighty UNIT contain Missy? As the Doctor faces his greatest challenge, sacrifices must be made before the day is won.”