Raytrix have been selling light field cameras for several years, although mainly for industrial uses. The light field properties also allow the higher end cameras (20,000€+) to generate 3D models from the images they have photographed.
They are used a lot in the auto inudstry for quality checking.
http://www.raytrix.de/index.php/Cameras.htmlThe R29 has a resolution of 7.3 megapixels and can make 100 layers. It can also use standard Nikon F-Mount lenses.