It's probably not a huge shock, but Maisie Williams killed dead the rumours that she would become the Doctor's latest companion, meaning we've seen the last of her series 9 character Ashildr — at least for now. Williams told BANG Showbiz that she wouldn't be working on Doctor Who again. "Everyone's hyping about it, which is very exciting, but I guess that's more of a publicity thing," she said. "But no, I'm not going to return, I have a lot of other really exciting projects lined up instead."
This makes sense. Williams already has a full-time gig in Game of Thrones. Two series would severely limit the number of other projects she could do. Besides, in the Who universe, the problem with bringing Williams back to Doctor Who is that Ashildr is tied pretty heavily into the fate of Clara. They'd have to at least address that if they made Ashildr the new companion.
In other Doctor Who news, Radio Times is reporting that the spinoff set at Coal Hill, Class, could be getting a visit from Capaldi. This also isn't a huge shock, since Capaldi's Doctor has enough connections to the students of that school to make his appearance logical. According to the Radio Times, once source "close to the production" said that Class "will have a close connection with Doctor Who so don't be surprised if Peter pops up."
Which is at least a nice change from Sarah Jane Adventures, where no one knew or would say if the Doctor was ever going to make an appearance.