Expect a one hour downtime for US Servers in the morning.
US EQ2 Servers will come down on Thursday, April 18, at 7:00 am Pacific Time for an update. The expected downtime for US servers is one hour. The EU servers will come down at 9:00 pm Pacific Time; the expected downtime for EU servers is 2 hours.
Here's the patch note:
Fixed some issues related to guildhall gatherers.