This is not a rumor now. Yes, Blizzard is changing their publisher of World of Warcraft in China now.
NetEase and Blizzard today announced that the operation of WoW in China will be transfered to NetEase after the license's expiring in this June. And it is a 3-year service agreement.
Chinese players are waiting Wotlk for so long time. Hope NetEase brings Wotlk to China earlier.