Board Thread:The Panopticon/@comment-1451563-20180913002703/@comment-5918438-20190111034440

It's not in-universe, but the new DWA Special (previewed online; I can't find a place to buy it) uses singular they to refer to the Doctor in general:


 * "The Doctor is famous for their awesome ability to regenerate."

It's in an out-of-universe segment with facts about the Doctor, which otherwise uses she/her to discuss the latest incarnation specifically. Like 12D 0 before it, though, it establishes that these official publications have opted to use they/them for the Doctor when discussing them generally, and he/him or she/her for specific incarnations, just as we have.