Like the show's upcoming eighth series, the 2015 episodes will air as a single uninterrupted run, Moffat told Doctor Who Magazine.
"We're not going to do splits [in series eight], and the same format will repeat exactly the following year like that - so it will be the traditional form," said the sci-fi drama's head writer.
Doctor Who's eighth series - the first to star Peter Capaldi as the Doctor - is expected to air on BBC One from August.
Filming on the new episodes began this week, with a first-look image of Capaldi on-set with co-star Jenna Coleman (Clara) unveiled on Tuesday (January 7).
The first two instalments will be helmed by Sightseers director Ben Wheatley.
Doctor Who Magazine issue 469 is out now.
Doctor Who, Peter Capaldi and series 8: Everything you need to know
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