A BBC Spokesman has recently said that a good chunk of Series 7 episodes will be broadcast next year.
Steven Moffat said to SFX:
“I don’t know [when new episodes will air]. If I did know, I wouldn’t tell you. When I do know, what I know will change, so I won’t really know then either.”
He continued: “Then it will change again, so I still won’t really know. And if, secretly, I’d really known all along, I’d still be telling you I don’t know, because everything I said I knew, could be wrong, so I’d never really have known in the first place.”