These kind of conversations go on all the time. An automaker will consider variations on the theme of a particular model, and the rabid media will occasionally pick up a snippet of that chatter and blow it way out of proportion. We can't say whether rumors
of a two-door M coupe are reality or just spitballing, though many would argue that such a model is a necessity for success.
A two-door M could be offered in both V6 M37
form, and with a V8 as the M56
has a rendering that shows a pretty spiffy premium coupe with a unique roof pillar treatment. It's a nice rendering, but we can posit that the production version won't be wearing a piece of C-pillar finery to make a '61 Valiant jealous.