All U.S. servers will come down at 7am PDT on Thursday, August 23, 2012. The expected downtime is one hour. Here are the patch notes:
The Ancient Construct mercenaries from Skyshrine should now be smaller once summoned.
The Lovebirds' Roost - Ferink no longer thinks Jojo is in Stonestair Byway.
Source: EQII Forums