The gender-neutral title Mx may be joining the honorifics Miss , Mr , Mrs and Ms in the Oxford English Dictionary. OED assistant editor Jonathan Dent:
“This is an example of how the English language adapts to people’s needs, with people using language in ways that suit them rather than letting language dictate identity to them.”Here, from The Guardian , is the most helpful article on Mx I could find. Newspaper articles referring to the “next edition” of the OED are almost certainly in error: the online OED is updated quarterly.
[See also the Swedish gender-neutral pronoun hen, which has several uses. The honorifics Mr , Mrs and Ms appear in the OED without periods.]