Radio Times report that the BBC yesterday (October 6 UK) projected an enormous Sontaran ship onto Liverpool's George’s Pier Head as another season 13 teaser.

The BBC have also revealed that Liverpool was chosen for the ship projection because that's where season 13 will begin and where the Doctor will meet a new character played by UK comedian John Bishop.

We still have no news on Doctor Who's release date beyond it being this year.

References

Cremona, Patrick (October 7, 2021). Doctor Who appears to confirm return of classic monster for series 13. Radio Times.

Doctor Who [@bbcdoctorwho] (October 7, 2021). Mysterious aircraft seen tonight over the Liverpool docks... #DoctorWho. Twitter. [Image source]