On Taiwan WoW Official Site, there is an announcement which says that Patch 5.1 will be live very soon.
http://tw.battle.net/wow/zh/blog/148...%81-2012-11-23
Patch 5.1, the first content patch of World of Warcraft:Mists of Pandaria will be live very soon, here are new features and contents in this patch. Are you prepared to land the beach with us? Ready to have fun and enjoy yourself!
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so, 5.1 will be live this or next week?