The point is that is not safe to assume that product upgrades make a camera more suitable to underwater use
Example if Sony comes with a 24mm equivalent lens this will mean that fisheye wet lens options will be problematic
There are no major issues with the rx100 to require a product upgrade as long as you have the right additional gear
If I had a canon s95 I would get myself add on lenses and strobe as those are likely to be recycled for the rx100 and you could pick up a good deal in two years
Example if Sony comes with a 24mm equivalent lens this will mean that fisheye wet lens options will be problematic
There are no major issues with the rx100 to require a product upgrade as long as you have the right additional gear
If I had a canon s95 I would get myself add on lenses and strobe as those are likely to be recycled for the rx100 and you could pick up a good deal in two years