Moffat told Collider: “Mark [Gatiss] will be starting [to write] very soon. He may have started. I’ve got to finish my Doctor Who Natale special, and then I’ll be straight onto Sherlock after that.”
"There's this assumption about fan that they're nuts," he tells the new issue of Red magazine. "But they're people that are really passionate, and I like that.
During the Scrivere of "His Last Vow", Moffat also wrote a scene about what Sherlock and Irene did after he rescued her from the terrorists in Karachi. However, the scene was never meant to be filmed.