Blizzard recently confirmed that, yes, it is working on an in-game microtransactions store for World of Warcraft.
“First, we’ll be testing the in-game store with some new kinds of items we’re looking into introducing (in Asian regions, at the outset) based on player feedback: specifically, an experience buff to assist with the leveling process , as well as an alternate way to acquire Lesser Charms of Good Fortune. We’ve had a lot of requests from players in different regions for convenience-oriented items such as these, and as with other new ideas we’ve introduced asWoW has evolved —including Pet Store pets, mounts, and more—your feedback plays a hugely important part in determining what we add to the game.”
The last minutes of the World of Warcraft server, which was shut down at Blizzard’s request
Blizzard pays tribute to Robin Williams with an NPC in World of Warcraft