A post to the ICTs for Development Blog has an explanation from Professor Richard Heeks that interpretations of a new ruling that say China has banned gold-farming are not actually accurate (thanks IncGamers). According to the professor, the new law impacts the reverse situation, banning using virtual currency to buy real items:

This is a government restriction on the use of the quasi-Paypal-like currencies (mainly QQ coins) that are used extensively in China to pay for virtual game stuff. As announced they can now only be used to pay for virtual stuff, and you can’t buy real things with them as game companies were allowing to happen, nor can you gamble. This therefore is not about what gold farming clients do: use real money to buy these virtual currencies; it’s the mirror image. And it’s not about the major trade in gold farming such as World of Warcraft, which relates to other types of virtual currency. And it’s not about buying/selling in-game items. And it’s not about the power-levelling of avatars. Bottom line: it’s not about gold farming.