I just read about the new Olympus E-M1 Mark II and it looks promising. Most of the new features look questionable for underwater but new sensor, improved DR and better focus tracking look promising. There is also an interesting pro capture mode that would not work with strobes but would be interesting to use with a video light or in ambient light. Larger battery and dual sd cards are nice. Still works with the little pop-up flash, but I hope Nauticam will offer a flash trigger for it in the new housings whenever they appear.
Also, Panasonic is going to offer an 8-18 lens that will be interesting to compare to the current Panasonic and Olympus 7-14 lenses.