All U.S. servers will come down on Thursday, February 28, 2013, at 7:00 am Pacific for an update. The estimated downtime is one hour. The EU servers will come down at 5:00 am London Time on Friday, March 1, 2013. The expected downtime is two hours. Here are the patch notes:

POPULATION / ZONE PROGRESSION
Sleeper's Tomb: The Forgotten Catacombs

• The Eternal Sentinel now only needs to trample the smaller gargoyles once each to knock them over.

Wurmbone Gulch

• [Heroic] - Merglok the Slasher gives you more time to move away. He will give a message every time he is going to go into "Clawed Storm". Clawed Storm has had its damage reduced.
• [Advanced Solo] - Merglok the Slasher will give a message every time he is going to go into “Clawed Storm”. He claws slower now and Clawed Storm has had its damage reduced.