There's still four more specials coming up. Those include the next Christmas special, and they're all (at least co-)written by RTD.DoctorWho said:I'm still not to sure of the timeline. This Christmas special doesn't count as one of the "Three specials" as far as I know. Is that the same for next year's Christmas special? So we have three Doctor Who specials to look forward to before December 25th next year? I guess next Christmas is when Moffat would start.
All that's known right now is that Planet of the Dead will air this Easter, and the final two specials will be a two-parter, and RTD's grand way of saying goodbye to the show. Those will probably air over next year's Christmas break.