From The9 website:

Shanghai, China – May 19, 2008. The9 Limited (NASDAQ: NCTY)(“The9”), a leading online game operator in China, announced today that it will suspend the operations of World of Warcraft, Soul of The Ultimate Nation, Granado Espada, Joyful Journey West, and MU from May 19, 2008 to May 21, 2008, in response to the government's calling for three days of mourning for the earthquake tragedy in Southwest China. The operations of the foregoing games will be reestablished starting from the calendar day of May 22, 2008.

The9 handles WoW's Chinese servers and localization. Allakhazam adds their condolences, thoughts, and prayers regarding the horrible situations this earthquake has unleashed.