Sorry folks, the lens has been sold.
Craig -- yes, the WWL-1 lens does have some heft and bulk to it. However, Nauticam has a mounting bracket so you can attach the wet lens to a strobe arm, which makes it pretty easy to carry around. In the water, I did not find the weight or bulk to be much of a problem. That said, I am just not sure how much I would use this lens. I will be posting on my blog (just google "Norbert Wu blog") a pretty comprehensive review of the WWL-1 lens, hopefully by the end of the week.
PS to lutfu: On the 12-50mm lens, the WWL-1 lens vignettes at around 16mm, from my tests. If you use it with a 12-42mm lens, for instance, it will be wider on the latter lens.