It’s called 'A Christmas Carol '- is - 'A Christmas Carol'

In this interview published by The New York Times Steven Moffat talks about a few things we've all been worrying or, if not worrying at least wondering about. Starting with the Doctor mysteriously marrying Marilyn Monroe, or how he managed to write his first Christmas special in mid-April, up to whether Moffat is planning to do a Doctor Who-Sherlock cross-over, or not.

Well, I suppose you read it yourself...