Last year, Blizzard revealed a set of Mahjong of MoP themed in BWC and took some bookings at the same time. The Mahjong is limited to 1000 set worldwide which is eminently collectable. However, there is no further information about the Mahjong since then. According to the officials, the plan to release the Mahjong was postponed because Blizzard made some improvements of the Mahjongs crafting and details to make it perfect for players.
via N4G: pc news feed http://n4g.com/news/1239527/blizzard-mop-themed-mahjong-is-available-for-booking-in-may
via N4G: pc news feed http://n4g.com/news/1239527/blizzard-mop-themed-mahjong-is-available-for-booking-in-may