Doctor Who: First Glimpse of Doctor Who's Christmas Villain If you read the whole article, there are lovely little tidbits at the end:
Moffat said you have to give the Doctor credit for "dumping a slightly clingy girlfriend" by sticking her with a clone. - *DIES*
Asked about bringing back random old characters from the classic show, Moffat said it's most important to tailor the show for the new eight-year-old viewers. "We're not in the business of doing nostalgia, we're making nostalgia for the future." - Good. I want new things and new places and new villains. I'm very excited about him taking over.
Also, asked whether his Who would be too frightening, he responded: "If your concern is that with me taking over Doctor Who, it's going to be really really frightening every week, then tough." (But Moffat also told Sci Fi Wire that we shouldn't expect all of his episodes to be the same as "Blink," because he'll have to vary his style more when he's overseeing a whole season.)
The Doctor's daughter didn't die, as originally planned, because Moffat made an off-hand comment to Russell T. Davies that introducing the character and killing her in the same episode would be "what Star Trek would do." - Again, *DIES*