I hope the AF is better than on the G1 X (which sucks...), I didn't like it.
I would use such a Cam for extended reach and quick moving subjects.
An EF & EF-S adapter would certainly be a must for a successful, late introduction to the developed market.
It has to compete against a Nikon 1 (horrible grip & control, but rest is great) and the rocketing market of 4/3 (...OM-D E-M5 is promising...),
Canon is last to the mirror-less market, so it better be reeeeally good, otherwise...
My expectations are higher, higher even than for the Canon "53"