From the EQ2 Forums on November 26, 2013 @ 11:00am PST (2:00pm EST, 19:00 GMT, 20:00 CET):
All servers are coming down for an unscheduled update as soon as possible to address an outstanding technical issue. Downtime is anticipated to be approximately one hour.
UPDATE: Plus or minus 20 minutes…
UPDATE: Plus or minus 40 minutes…
UPDATE: Plus or minus 60 minutes…
UPDATE: Servers are going down at 12:15pm PST (3:15pm EST, 20:15 GMT, 21:15 CET).