Armory going down for Wrath updates
Crygil posted early this morning that the Armory will be going down at 6 a.m. PST / 9 a.m. EST to prepare it for Wrath of the Lich King. The Armory will be down for approximately eight hours.
He doesn't go into specifics about what will be updated, but we have some good guesses at what we could see included:
Achievement listings
Wrath of the Lich King items
New reputations
Faster character data updates
Crygil also mentions that all the character data will be reset. This
means that you have to log into your character to repopulate the Armory information on it. This is important if you have seldom played alts yet still refer to the armory data, or if you are currently applying to a guild that requires armory information.
We'll have more concrete information on what this update brings after it's complete, sometime around 2 p.m. PST.