The DxO ONE camera is scheduled to start shipping on September 24th, but according to this video/review from Luminous-Landscape the module has one very serious problem:
"While the camera looks great, I found it very hard to hold when connected to the iPhone. I ruined a number of images because my right index finger was always getting in the way of the lens. So with my big hands holding the camera, it got to be a challenge. The camera rotates using the lightning connector as a pivot point. This allows for easy shooting at low levels or above your head. Using the shutter release button in the over-the-head or low-level position became a challenge. I ended up using my thumb while shooting low levels and when I wanted to do one-hand shots over my head while just holding the DxO unit, it didn’t go well. It was dangerous because the iPhone tended to come loose when doing this. Essentially, as I found out, this combination as well as normal shooting was really meant to be a two handed operation."