If there will be a good EVF to clip on, hopefully one that isn’t too bulky, the camera might become a winner. That lens is incredibly compact for a 600mm equivalent zoom for a 1″ sensor; I wouldn’t have thought such a lens could be made in that size. Maybe they’re using diffractive optics? Ok, when zoomed out to give 600mm it will probably be two or three times as long as what we see here, but nevertheless…
I do like the rangefinderesque design; much better than all the other bulky DSLR-style superzoom compacts.
Then again, it clearly isn’t pocketable anymore, so for a compact camera I’d probably still prefer something with a slightly smaller sensor, liker 1/1.7″ or 1/1.8″, and a slightly smaller zoom range, like the Panasonic Lumix DMC-LF1 aka Leica C (Typ 112).
If the G3X lens is really good, for some it might be an alternative worth considering to a supertele-zoom solution based on a DSLR or mirrorless camera.

Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.