Image quality, vignetting, flare and distortion test results along with specs, measurements and standard product images have been added to the Irix 15mm f/2.4 Blackstone Lens Review page.
A full review of this lens is coming soon. Note that the upper right corner shown in the image quality tool is sharper than the other three corners.
Amazon has the Irix 15mm f/2.4 Blackstone Lens in stock. This lens will be arriving at B&H and Adorama soon.