According to 'The Telegraph' and a few other sources. Jenna Coleman will be leaving Doctor Who to play Queen Victoria in an upcoming mini series called "Victoria"
Jenna played companion to Matt Smith and Peter Capaldi and was reportedly leaving last year but she decided to stay on resulting in the writers rewriting the Christmas episode.
I for one am very excited to see how they write her departure and who they get to replace her. I was never a huge fan of her characters story line.
I hope they finish out her story line and give it an interesting twist at the end. I think I will be tuning in to see how this plays out.