Today, after a lot of data mining (it’s a new profession in WoW beside the usual ones) WoW Database discovered inside patch 5.4 data an interesting item, Enduring Elixit of Wisdom. This item increases experience points by 100% for an unknown time. This may be the first time in WoW’s history that an item like this may be purchased.
UPDATE: Zarhym, CM for World of Warcraft confirmed this rumour on the battle.net forum. He said: “We are currently exploring the possibility of adding a way for players in certain regions to make purchases directly within the game. As part of this process, elements related to this will be appearing on the PTR. We’ll provide additional updates on our plans as development progresses.”