There are definitely tons of fads in Japan, I know alllllllll about them (^_^).
However I am very curious about MTI, so many pros play them and not a single one is paid to do so yet they are paid big bucks and by their own sponsors but don't play their wedges. Miyagi was a one man show much like Carlton and Sasaya and custom grinded every single one for every player, though I highly doubt that will be the case for the retails.