Along with the Zeiss Touit 2.8/12 and 1.8/32 lenses, the Zeiss Touit 50mm f/2.8 Macro Lens is now listed at B&H Photo Video website. According to B&H, this lens will be released and in stock on October 1, 2013.
The Zeiss Touit 2.8/50 macro lens will available in Sony NEX E-mount and Fuji X-mount.