Void Storage and Transmogrifier - Patch 4.3 Teasing?
A teaser on the official Warcraft Facebook Page hints at two new types of NPCs coming in a future patch, most likely Patch 4.3: the Transmogrifier and Void Storage NPCs.
"Transmogrifier" seems to hint at a way to change the appearance of something, the first thing coming to my mind is either a way to change the look of your items (it was experimented in the past with things such as Darkspear Overcloak but dropped later). I guess it could also be a way to change facial/body features on characters.
The "Void Storage" is probably ... well, another kind of storage? Or a high-tech magic trash can.