Considering Steven Moffat likely had a hand in deciding who should be the next showrunner of Doctor Who, it comes as a surprise that Mark Gatiss was apparently not approached for the job!
At Attitude‘s Bachelors of the Year Awards, Gatiss – who is, alongside Moffat, one of only two people who have written for the show since Series 1, and have contributed to Series 10 – revealed:

“I’m fine I wasn’t approached for the showrunner position. I don’t have any idea what will happen in the future. I don’t have any plans to write for the show next year. It’s nice to watch with no idea what will happen.”

This is an undeniable shock: Gatiss is a long-time co-conspirator of Moffat’s, and as Russell T. Davies had a hand in offering Steven the job, you’d presume Mark would at least be approached.
What can we presume from this? Perhaps the offer was taken out of Moffat’s hands, decided instead by the BBC. Maybe Gatiss told Steven he wouldn’t be interested, as he has other work on (including the anniversary return of League of Gentlemen). I doubt we’ll know for a while – if ever!
It’s also interesting that Gatiss hasn’t been asked to write for Doctor Who next year, under incoming showrunner, Chris Chibnall. This could be a fib, of course, or he might be taking some time away from Doctor Who – after all, he didn’t write for Series 3 or 4, although did appear in the former as Richard Lazarus in The Lazarus Experiment (2007).
What do you think, dear reader? Did Gatiss deserve a try at the top spot? Would you like to see him writing under Chibbers? Personally, I’ve enjoyed the majority of his episodes (especially Cold War, The Crimson Horror, and yes, Sleep No More), so I’d welcome his return! It’d be a shame if The Empress of Mars is his last for the series…