how was it promoted?
A minute-long clip was released on the "Doctor Who" web site. The first teaser for the series was released during the final of the 2018 FIFA World Cup
Doctor Who (series 11)
On 16 July 2017, a minute-long clip was released on the "Doctor Who" web site, after the 2017 Wimbledon Championships men's finals, introducing Jodie Whittaker as the Thirteenth Doctor. The first teaser for the series was released during the final of the 2018 FIFA World Cup on 15 July 2018, 
when will dr who season 11 be on netflix UNANSWERABLE when did shooting begin? 31 October 2017
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Doctor Who (series 11) [SEP] Promotion
On 16 July 2017, a minute-long clip was released on the "Doctor Who" web site, after the 2017 Wimbledon Championships men's finals, introducing Jodie Whittaker as the Thirteenth Doctor. The first teaser for the series was released during the final of the 2018 FIFA World Cup on 15 July 2018, almost exactly a year following the official announcement. Whittaker, Gill, Cole, Chibnall and Strevens promoted the show with a panel at the San Diego Comic-Con on 19 July 2018, where the first trailer was released. The second trailer for the series was released on 20 September 2018. The premiere of the new series was held at The Moor, Sheffield on 24 September 2018, as part of a red carpet event for the first episode and eleventh series.