The new Olympus PT-E06 housing is now shipping for the (also new) E-620 DSLR. Features are identical to the PT-E05 with a few controls moved. Includes cam-lock closure, dual rear o-rings, slide out mounting tray, etc. Dual optical sync ports along with one Olympus hard-wired bulkhead. Previous Olympus ports are compatible. 40 meter/140' depth rating.

I also tested it's fit on the Sea & Sea RDX Grip Stay-L Tray. Olympus doesn't have a decent 2 handle solution (or certainly one that is available in the US). It fits very well with lots of room for adjustment. (On the photos I've moved the handles in quite a bit.) Although it is expensive (MSRP $335) it does have a quick release that's a very nice feature. It's about 2.5#, and I believe that it will make the Oly system a bit negative, but not more than a pound or so. I've added Optical Ocean Sales Ball to Base adapters, the tray only comes with the standard S&S slide-on mounts.