The new PTR 3.1 Raid Schedule covers March 31-April 1. Today it is Hodir (Hard Mode) for USA and no test for Europe.  Wednesday it is Iron Council (hard Mode) for USA and General Vezax (Hard Mode) for Europe. Make arrangements with your guilds to help test these bosses, and make sure to offer feedback and bug reports.

Blizzard Quote:
Here’s the current schedule for Ulduar PTR testing:

On the North American test realms:

Hodir (Hard Mode) – Tuesday Night, March 31, starting at 7pm EDT/4pm PDT.
We’ve made some adjustments to the NPC mechanics in an effort to better balance the ability for melee and ranged players to do damage.

Iron Council (Hard Mode) – Wednesday Night, April 1, starting at 7pm EDT/4pm PDT.
We’d like Steelbreaker last tested again, we have Static Disruption working again.

On the European test realms:

General Vezax (Hard Mode) – Wednesday Night, April 1 at 19:00 CET.
We’ve made further adjustments to try and balance the the effectiveness of ranged DPS casters and melee in the fight.

For Hard Mode testing, Shirts of Uber will be available on Ursula McWeaksauce to help simulate a raid having obtained Ulduar gear. Check the entrance area of Ulduar for the vendor.

This schedule could change at a moment’s notice due to server, bug, or patch status. I’ll try to keep everyone informed as much as possible. Ulduar and the bosses to be tested will remain also open a variable length of time. How long they stay open depends upon a host of factors including designer availability, bug status, etc.

We’re very interested in seeing combat logs and parses for all raid testing on the PTR.

Quick Ulduar FAQ:

Q) Where’s all the trash?
A) Trash is complete, and players will see the trash associated with each boss during their tests.

Q) Where’s the loot?
A) All loot is present.

Q) What about achievements?
A) All achievements are active.