The BBC have released the synopsis for Kill The Moon which will air on October 4th and is the 7th episode of Series 8. No time has been announced but if you go by the Radio Times article yesterday it will most likely be at 8:30 on BBC One and 9PM on BBC America.
In the near future, the Doctor and Clara find themselves on a space shuttle making a suicide mission to the Moon.
Crash-landing on the lunar surface, they find a mining base full of corpses, vicious spider-like creatures poised to attack, and a terrible dilemma.
When Clara turns to the Doctor for help, she gets the shock of her life.