Blizzard poster Slorkuz has announced the updated schedule for Ulduar PTR testing. It is as follows:

On the North American test realms:
Flame Leviathan - Tuesday Night, March 24, starting at 7pm EDT/4pm PDT.
Hodir (Hard Mode) - Wednesday Night, March 25, starting at 7pm EDT/4pm PDT.

On the European test realms:
Flame Leviathan - Tuesday Night, March 24 at 19:00 CET.
General Vezax (Hard Mode) - Wednesday Night, March 25 at 19:00 CET.

Also, in a quick Ulduar FAQ, it has been stated that trash has been completed and should be seen with each associated boss during the tests. All loot should be present and all achievement should be complete. Keep reading after the jump for more information.

Emalon the Storm Watcher is also available to be tested in the Vault of Archavon depending on PTR Wintergrasp status. Test Patchwerks will also be available on Wednesday.

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 has now been completed, and players will see the trash associated with each boss during their tests.

Q) Where's the loot?
A) All loot should be present.

Q) What about achievements?
A) Should all be complete now. As always, please report any bugs.