A BBC spokesperson said that scheduling for the hit sci-fi series cannot be confirmed at this stage, reported Digital Spy.
"It's too early to confirm the schedule for future series at this point, but the new series starts on Saturday, September 19," they said.
Apparently Steven Moffat's commitments to "Sherlock" will preclude him from working on "Doctor Who" full-time next year.
The last time that "Sherlock" shot a full three-episode run was in 2013 and, indeed, "Doctor Who" did not film a full series that year, instead producing two bumper-length specials.