I’d put money on it being a person of colour actually.
Nah, the “sizable minority” (as I seem to recall it was called) who thought that the world was ending because the last Dr had a vagina will properly loose their collective shit if he/she turns out to be black. I’d imagine that the BBC, given the culture war that’s currently swirling around them and the right wing papers, will want to totally swerve that one.
So, yeah, white man mid 40’s slightly good looking, someone the grannies can say “Ooh, isn’t he charming” etc etc…