While Canon's previous EOS M and M2 were simply Canon dipping their feet into the mirrorless waters, the new APS-C sensor M3 is a bit more grown up (we have an optional EVF now). Compared to offerings from Sony and Samsung (like the 4K NX500), however, these still have a long way to go. It also looks like at least for the time being that North American shooters won't be able to get their hands on one, as Canon, just like they did with the M2, has not chosen to release it on this side of the Atlantic.
Here are some videos taking a look at the M3:
Essentially the M3 got most of the guts from the T6s/i cameras, so expect still and video quality to be pretty similar. Here's what the specs look like for the EOS M3: