#1 - Aug. 2, 2011, 12:50 a.m.
As of right now, US and Europe are live and populating, and Korea will be following in a couple of days.
Please refer to the documentation at http://blizzard.github.com/api-wow-docs/#id3683980 for further information, and don't hesitate to post any thoughts on this thread.
Thank you for your patience!