[AkibaSilver]

http://www.bbc.co.uk/news/entertainment-arts-36527188
Matt Lucas is coming back in Series 10 as a reprisal of his character from the christmas special. In addition, we know the writers of episode 1 and 2: Steven Moffat, and then Frank Cottrell-Boyce, otherwise known for In The Forest Of The Night.

Because that one was so great.

We also have episodes (unknown numbers, other than Block Two) from Sarah Dollard (Face The Raven) and Mike Bartlett (Writer of Doctor Foster)