flysurfer
Hall of Famer
I cannot find the link, but I read that an M version would be very hard to make since the delta between the XF and M mount aren't that great.
Yep, that's why I asked if I have somehow missed the announcement (or rumor) of such a new design. It would be very welcome news for plenty of M users. There's nothing official on the Metabones website, their latest version appears to be for the Contarex mount.