Kenko 400mm f8 mirror lens and adapters for ...mirrorless systems (M43rds, NEX)

I don't recall recalling if this was mentioned before, but Japanese website DC Watch Impress (computer translated) visited the Kenko-Tokina booth at CES-PMA and spotted a 400mm f8 mirror lens with adapters for the Micro Four Thirds and NEX mirrorless systems. Granted, they are different kind of mirrors, but it is a mirror lens for mirrorless camera systems ;-) From what I can make out of the computer-translation this is a prototype but someone at the booth guestimated a price of $200 to $250.