Whittaker will return for at least one more series:
https://www.radiotimes.com/news/tv/2020-01-23/jodie-whittaker-will-return-as-the-doctor-for-at-least-one-more-series/
https://www.radiotimes.com/news/tv/2020-01-23/jodie-whittaker-will-return-as-the-doctor-for-at-least-one-more-series/