Though it remains against WoW's terms of service to buy gold for cash through third-party sales sites, you can now buy gold directly from Blizzard via the WoW Token.
Three small hotfixes for patch 6.1.2 have been released this evening, including an Ashran adjustment that should make the achievement Take Them Out a little easier for players to obtain.
A new batch of hotfixes for patch 6.1.2 have just been released. Today's list includes several changes and adjustments to the Blackrock Foundry raid, including several tweaks to the Blackhand encounter on Mythic difficulty.
Blizzard hasn't released an exact date that the gold-for-gametime WoW Token will be arriving in game — it will be some time after tomorrow's roll-out of patch 6.1.2 — they have announced it will cost $20 USD.