I went to a meeting of BSoUP last night and there were D200s everywhere! There is no doubt this is going to be a very popular UW camera.
Anyway I just spotted a post by Thom Hogan on DPReview where he draws people's attention to this interview with Kiyoshige Shibazaki a senior Nikon imaging bod, which I think will be of interest to potential D200 shooters.
http://nikonimaging.com/global/technology/scene/12/index.htm
Alex