Well this was just posted:
[NA] Several Worlds Emergency Maintenance (Aug. 24)
At the following time, we will be performing emergency maintenance. During this period, the Worlds listed below will be unavailable.
As we previously announced on the “Regarding the Instance-Related Issues (Aug. 24)” announcement, we will be conducting maintenance to address the issue wherein players are unable to access instances.
While we previously stated that we will be optimizing the servers prior to the emergency maintenance, we will require additional time to also implement counter measures to decrease the load on the servers.
While we estimate the time frame of the maintenance to be around two and a half hours, we will do our best to complete the maintenance as soon as possible.
We sincerely apologize for any inconvenience this may cause and thank you for your understanding.
[Date & Time]
Aug. 24, 2013 from 3:00 p.m. to 5:30 p.m. (PDT)
* The completion time may be subject to change.
North American/European Data Center Worlds