Backscatter just posted their LX100 II review. They used the AOI UWL-09 Pro wet lens, and the images look good. If I go down the wet wide angle lens route again (still undecided), I lean towards the Nauticam WWL-1, just because Nauticam now has a float collar for that beast, and the AOI lens does not have that
There were a few points in the review that were incorrect: the camera has a 4/3 sensor, but the image circle on the lens does not cover the entire sensor, though it is a multi-aspect ratio sensor. The camera uses about 81% of the sensor (it's the 21 MP sensor in the GX9, the LX100 II uses 17 of those 21 MP). The other point, which is noteworthy is that the electronic shutter does not determine flash synch speed. The LX100 II, and many other compact cameras, and some high end medium format cameras, has a leaf shutter mechanism. I don't fully understand them, but as I understand it generally -- the shutter mechanism is in the lens body, not on the focal plane with the sensor. It's actually a really neat feature, it makes the camera fantastic for "strobist" photography on land (google David Hobby and Strobist). On land, you can shoot with a leaf shutter camera at say 1/1000 or 1/2000 shutter speed, the flash will still synch and light your subject, and you can kill the ambient light in the background because the shutter is so fast. It's great on those sunlit days where the sun is high and the light is harsh. Underwater, it is really usefully to getting a darker, or even black background, like on a macro shot.