That’s absolutely coming. You’re going to find out very soon, and that means we have to do it next series, really… The critical thing here is I want to explain who she is, not explain away who she is. If you don’t deliver on most people’s expectations, and you just say, ‘Ooh, she’s a specially programmed android who believes she’s the Doctor’s wife,’ people will go, ‘That‘s a cheat.’ You can’t do that… It’s a really good story, and it’s sort of the story of next year.
Steven Moffat on the identity of River Song (via riversongfan)