The new Canon GX10 could be quite interesting! My AX100 Sony doesn't seem to have the brightness of color that my old Canon G10 did.
Looking at the pictures of the new Canon GX10 on B&H Photo's web site seemed fine - until I saw the "AIR INTAKE" and "EXHAUST VENT" labels on the right side of the new camera. I wonder if the 150 Mbps data rate causes some component(s) inside the camera to generate noticeable heat?
Any housing design for the GX10 would probably need to account for some heat transfer - trapping heat underwater couldn't be good, especially on hour+ dives.
Otherwise, I'm certainly tempted.
I've also looked at the advance information on the Sony AX700 which may replace the AX100; there doesn't seem to be enough increase in capability at first glance to be worth an upgrade. I didn't see any higher data rate, or frame rate.