Last week in Dominica I shot the D7000 in a Nauticam housing; an awesome setup! Great camera, great housing. But the photographer sucked!
I had great anticipation of shooting both video and stills and found that I fell into the trap of trying to do both, with the result that I did neither well. For example, I started to shoot a video sequence showing whales swimming into the frame, and then when the animals were in a great composition in the frame the temptation to shoot a still image was too great, and I shot some stills while trying to change perspective to get a better composition. Result, lousy interrupted video sequence, and lousy poorly composed still image. Came away from the experience much less excited about shooting video, as a someone with innate still photographer sensibilities. One of the guys on our trip had a GoPro fixed to his 5DMKII housing, which I thought would be a much cooler idea for me if I really wanted the option to shoot video while shooting stills. It seems you can't shoot both well at the same time with one camera - choose to shoot one or the other and stick to it.
I would be interested to hear thoughts on the differences in approach to shooting video and stills, particularly underwater, everything from exposure to composition and framing, storytelling etc, and how best to integrate them with the new VidDSLRS