"And when asked about the Daleks’ appearance, Chibnall gave an answer that didn’t exactly rule out their return in the New Year’s episode they were currently filming.
“We’ve got two weeks left of shooting, and we haven’t seen them yet,” Chibnall said coyly....
..."Because after stating they were a no-show this time around,
Chibnall noted cheekily that it was only “
this year” (emphasis on the ‘this’) that the deadly pepperpots were being left on the intergalactic spice rack.
By that logic, wouldn’t the 1 January 2019 count as
next year – and be the perfect time for the Daleks to make their grand return in front of a massive, slightly hungover audience?
And then there’s the newly-released New Year’s Day special trailer, which teases a truly terrifying alien monster that’s sounding more and more like a Dalek to us…
“This is the DNA of the most dangerous creature in the universe,” Whittaker says in the footage. “It’s not gonna stop until it’s taken control of this planet.”
“It’s gonna kill anyone that gets in its path.”
“Does it have a name?” asks Bradley Walsh’s Graham, to silence from the Doctor – though if we’d waited just a few moments longer, we wouldn’t have been surprised if Whittaker uttered the word
we’ve been waiting for for so long.
And THEN there’s the confirmed New Year’s Day special title, Resolution. Sure, it doesn’t have anything to do with our favourite denizens of Skaro – but a few fans have noted that this title feeds quite nicely into the ____ of the Daleks word structure that often accompanies episodes starring the species. It’s not SUCH a crazy idea that the BBC are giving us a hint with us, is it?"
https://www.radiotimes.com/news/tv/2018-12-09/doctor-who-daleks-return-new-years-day-special/