Actually, they do have an EVF as well as an optical VF. Hence the "hybrid" designation.
It has an optical viewfinder with an LCD overlay, but much more advanced than the one found in DSLR OVFs. It merely allows displaying of electronic data on an optical viewfinder; the "hybrid" designation is nothing more than marketing.
Everywhere...
...everywhere except for every NEX camera (though the NEX-7 has a standard adapter for its non-standard hotshoe), both Nikon 1 cameras, and the GF3/GF5.
Sony should be excluded because its hotshoe is a legacy hotshoe from the Minolta days. Makes sense, since we all know Sony bought Minolta's camera division.
I don't understand why Nikon decided not to put a universal hotshoe on top of the 1 series' EVFs. They do sell adapters, however. Mainly a design flaw (plus, who buys Nikon 1?).
THe GF3/5 lack a hotshoe altogether...again, a design flaw.
That's the whole point of a mirrorless design!! (unless your name is Pentax)
Jeez, I'm just pointing out the fact that it's the exact same mount as the EF mount! You can't mount an Alpha-mount lens onto an E-mount camera; it's physically impossible. Same with EF-S on EF. But in this case, you'll be able to mount EF lenses onto this EF-M camera, which would lead to the loss of infinity focus and other problems. This is a big flaw on Canon's side, as it has the potential to cause confusion among novice users who don't know of FFDs and lens compatibility.
Unless Canon has, by some evil magic, managed to keep the 44mm flange focal distance. Then all would be well. Probably not, though.
Point being, the lack of an EVF kills it for me.