Olympus announced a firmware update for EM-1 and EM-5 II. I own neither but the focus stacking option, only for the EM-1, could be of interest for macro. It takes 8 shots at slightly different focus settings with a single shutter release and creates a composite with increased depth of field. With powerful video light(s) instead of a strobe I expect this could work underwater, especially as you can open the aperture a bit more than you might normally do and still get adequate DOF. Of course it all depends on how well their composite-construction works but I hope to see some tests of this on wetpixel in the future. I am also interested in seeing comments on macro images taken with a video light as I've seen some promising examples online.