[Morgan.]

Speculation is rife that Chibnall is unhappy behind the scenes and doesn't want the showrunner job so is planning to step down as of the 2019 Christmas Special. Jodie has reportedly said she wouldn't want to play the Doctor without chibnall at the helm, so would also regenerate in the 2019 Christmas Special.

Chibnall has also claimed it's truly impossible to create a whole 10 episode series per year (BOLLOCKS) - so 2019 will have 5 episodes + Christmas and the remainder of the series is to take place in 2020 with a new Doctor resulting in another split series. If they cannot find a new showrunner by early 2019 then Chibnall will have to produce the whole of S12.

Finally Bradley Walsh and Tosin Cole (Graham and Ryan) are listed as highly unlikely to Stay on as regular companions, but Mandip Gills (Yaz) status is unknown and there's a chance she'll carry on as sole companion.

Obviously this is all speculation so take with a pinch of salt, but it all sounds fairly realistic as Chibnall didn't want the job in the first place and I know he's what attracted Jodie.