Nauticam seems to be on a mirrorless roll, as they've now announced their NA-EM5 underwater housing for the Olympus OM-D EM-5 model. Priced at US$1350, it is scheduled to ship in mid-July. Ports for most of the lenses you'd want to use underwater are available. The 12-50mm port even includes support for the power zoom and macro switches. As is typical for higher end underwater housings, the NA-EM5 supports S-TTL and DS-TTL flash units.