I wonder how this will affect Nikon's V1/J1 using a tiny sensor.
I see that camera being further marginalized by management's decisions to use a small sensor when other ML cameras are going with larger sensors.
I have an OMD and love the camera, what that camera has, is lots of lenses. Canon got it right with this camera, some native lenses, an adapter to use existing glass and the sensor size won't really impede photographers that much. I see the lack of EVF as a move to differentiate the ML camera from the DSLR.
I personally use the EVF 99% of the time with my OMD, so while this camera on paper looks great, I'd say lack of an EVF is a big thing (for me). Don't get me wrong, I'm not about to dump my OMD for the Eos m, but I can appreciate the nice design and competition.