All US servers will be brought offline on Wednesday, November 19, 2014 at approximately 7:00AM PST. Estimated US downtime is one hour. EU servers will be brought offline on Wednesday, November 19, 2014 at approximately 9:00PM PST (5:00AM London Time on 20 November). Estimated EU downtime is two hours.

Here's the patch notes:

POPULATION / ZONE PROGRESSION
Altar of Malice
Experience for defeating NPCs in Altar of Malice Solo and Advanced Solo zones has been increased.

ITEMS
Expendable items can no longer be transmuted.
Refining common harvests can no longer return high quality slag.