All U.S. servers will come down on Thursday, February 23, 2012 at 7am PST for a hotfix. The expected downtime is one hour. EU servers will have their update at 5am London Time on Friday, February 24, 2012. Estimated downtime is two hours. Additionally, the Freeport server will have an eight hour maintenance starting at 4am PST on Thursday, February 23, 2012.  Here are the patch notes:

MERCENARIES

• Mercenaries should do much less damage in PVP combat.  This should have no affect PVE combat.

ZONE PROGRESSION / POPULATION
Plane of War

• The Enraged War Boar now stands guard near the zone entry.

Vallon’s Tower [Challenge]

• During the final Vallon Zek fight, The Vallonite Volley Commander will limit the locations he spawns at.

Source: EQII Forums