I found some interesting information today on the next episode of Doctor who "Victory of the Daleks".
Steven Moffat has stated in an interview that half-an-hour into the episode, the audience will have a revelation and will have to re-watch the episode to understand it.
Also, Steven Moffat and Mark Gatiss (writer of the episode) have said that the Daleks will survive the end of the episode. In DWM #420, Steven Moffat says "I can see you all smirking at the title, and thinking 'Oh, I bet it's not a victory.' Yeah? Do you think?"and Mark Gatiss says "The reason it's called Victory of the Daleks is cos they win. They win."