We shouldn't forget that the EOS M was "an experiment", as their CEO said. There are no real rumors about the long-awaited M3. I do still believe that Canon will go mirrorless with their 'normal' SLR's (I expect the 7DII to be the first one -> hybrid VF, stunning video functions, many autofocus points etc.) and they will have an EF mount, otherwise they would kill themselves after building up a lens system for, I don't know, 40 years?! I wouldn't bet on the M system.
an experiment where every piece of glass for the system so far is damn good