Luds34 said:
How is the M10? It appears to be the same form factor of the original M and M2. There is a part of me, even if it means sacrificing the viewfinder, that really likes the original M size as it is kind of the ultimate compact APS-C kit (when paired with the 22mm pancake).
An M100 could interest me (at a cheap enough price) to fill that maximizing of IQ with most compact size camera.
I own the M10 (along with the M2 and the M); the flipping-up LCD is nice and kind of essential for Monday as I plan to use an iPhone-controlled (and tripod-mounted) M10 + adapter + (unfiltered) 100-400 lens for the two minutes or so of totality eclipse in my hometown (assuming a cloudless day!).
Normally the 22mm pancake is 'permanently' attached to the M10...for the exact reasons you've described (size, and of course, weight). Plus, the 22mm lens does not obstruct the on-board flash...sadly, the onboard flash, when fired while the 18-55mm M lens (as well as the 11-22 lens) is attached to the M10, DOES cast a shadow at wider angles. (I would be interested in knowing whether the somewhat smaller dimensions of the 15-45mm M lens enables it to interact better with the M10's onboard flash.)
There are occasional (mostly vacation) situations where the on-board flash is essential...I find the M10 to a very important part of what's available to me on our family trips.
On a related note: I had never attached a lens the size/weight of the 100-400 II to an M-sized body--two words come to mind: bad ergonomics. The amazing IS abilities of the 100-400 enable, in my hands, easy hand-held shooting with the 5D MkIII. But when that lens is attached to the M10...it just doesn't work for me.
M10s can be had for reasonable prices at the usual places...and the M10 uses the same battery/charger combination as the M and M2. I find the M10 to be a bit snappier as far as auto-focusing is concerned (compared, again, to the M and M2)...but not significantly better...but it is a noticeable difference.
There is no hot-shoe...so no place for a real flash nor for an external mic...and no input, either.
I've gotten used to the M10's point-and-shoot-style menu; the older M's are better in this regard.
The M10 is, therefore, kind of a point-and-shoot Canon with an APS-C sensor inside.
If the M100 has similar properties...with a much-improved sensor (and improved focusing abilities) inside...I will seriously consider it.
On the nomenclature front--I guess the real question is whether Canon will give the 'M' designation to their full-frame mirrorless offering.
If they do, then it would make sense to give it (the full-frame mirrrorless Canon) the M
X designation...say, M
1...where X is less than or equal to 3 (they won't do 4, right?).
For their ILC bodies, the single digits are both full-frame and cropped sensor models.
For their MILC bodies, perhaps the same will hold true.
Then, for both ILC and MILC bodies, the M
XX and M
XXX families will be cropped sensors...with the 3
X versions serving as the entry-level models.
All bets are off if Canon supplies their full-frame mirrorless bodies with a designation other than M.
My two cents.