If you want test a Sony-NEX System you can contact me, i use a Sony NEX-5N in a Nauticam-housing with the 30mm F3.5 Macro, 16mm Wideangle (with Fisheye-Converter) and INON-Flashes. The new ZEISS Macro is ordered and i hope it will comes in the next 2-3 weeks.
There are already details for the planned lightning trigger? It would be great if this would work with Sony TTL! For over water there are now several manufacturers, the Sony flashes with TTL produce. For example, Metz and Sigma.