DWM issue 428 has revealed that in A Christmas Carol Rory and Amy will be orbiting an alien planet on a pleasure cruise spaceship when it finds itself under attack from something very nasty, while the Doctor has a lot to deal with on the planet below to save the spaceship.
In Neil Gaiman’s episode three , the TARDIS breaks down on an alien junkyard world. “Although Idris is preparing for death as the story begins, she doesn’t actually die. By the time the Doctor and friends meet her she’s gone mad and ends up biting the Time Lord …”