fotobiblios
Established
At least one source of these mock-ups is a Japanese (print) magazine from earlier this year, which had several different pics of tasty M lenses on Ricoh GXR bodies, including some 'in use' by photographers. - I think these originated from the mag, not Ricoh, but at least they are putting pressure on the company to deliver such, by showing the need (or rather desire) - of course, nothing less than a full- frame sensor will do (?).