Doctor Who: Everything We Know About Revolution Of The Daleks
6. The Episode Will Be Aired Around Christmas 2020
The episode will be a one-off extended holiday special, not linked to the upcoming Series 13 which is expected to return in Autumn 2021. The last 'Christmas' special aired on New Year's Day 2019, with Series 12 starting on New Year's Day 2020, so it is likely that Revolution of the Daleks will follow suit.
Showrunner Chris Chibnall said:
We can’t leave the Doctor there! On that cliffhanger! Well, we did. But rest assured, the Doctor and her friends will be back for a one-off extended special around Christmas and New Year. (I don’t know when they’re going to put it on yet, otherwise we’d tell you!). There will be Daleks. There will be exterminations. Thrills, laughter, tears. You know. The usual. See you at the end of the year.