This is a question I would be interested in finding out as well.
I would very much like to see Nauticam make a flash trigger for the OM-D cameras like they make for Canon, Nikon, Sony (A7 line) and in a mini version for Panasonic GH-4 and Fujifilm XT1. The flash trigger is designed for use with fiber optic cables only and work in TTL for some camera brands and in manual flash power settings for other brands like Panasonic.
I use manual flash settings exclusively and I am sure many other OM-D users do the same based on the numbers of comments on this and other forms regarding the use of the OM-D's 1/64th power setting to conserve the camera's battery power. The Nauticam flash triggers are powered by a small flat user replaceable battery which lasts for quite some time because of the very low power draw required to trigger the small LCD lights. With external strobes like the Inon Z-240's set to low power settings you have the ability to shoot at several frames a second with proper strobe batteries. These flash triggers are very useful tools and conserve the cameras battery power which is one of the down sides to the Olympus OM-D line of cameras.
All of the Nauticam flash triggers retail for $220.00 in the US. The price would be worth it to me for the additional creative ability of shooting at 6 to 10 frames per second and for the ability to squeeze several more shots out of the Olympus camera battery.
Did not mean to side track your thread oskar but would be interested to know if any other OM-D users would be buyers for a Nauticam flash trigger.