The Wrath of the Lich King Classic Patch 3.4.2 PTR is now Live and Blizzard has provided some Patch Notes, which you can view below. Here is a link to the PTR Testing Schedule.
Greetings!Welcome to the Wrath of the Lich King Classic Patch 3.4.2 Public Test Realm!Build: 49442 May 4th 2023Testing FocusTrial of the CrusaderThe Trial of the Crusader and Trial of the Grand Crusader 10 and 25 player raids will be available for testing starting Friday May 5th at 11:00AM PDT and will remain available until Monday May 8th at 10:00AM PDT.To access the Raid you will need to travel to northeastern Icecrown and enter the raid dungeon via the portal at the Argent Tournament Grounds. To facilitate testing, we have re-enabled character copy for players to copy their live characters, and starter level 80 characters may be created using the available Templates.
Please note that vendors have not been updated with Ulduar loot for this testing period. Trial of the Crusader (Normal Mode) share a lockout with Trial of the Grand Crusader (Heroic Mode), but you may dynamically swap from Normal to Heroic and back again within the same raid size.
For example, if your raid group clears the raid up through Faction Champions on Heroic Mode, you may swap to Normal mode and complete the instance on Normal. You may also do this difficulty swapping on a per-boss basis.
Using the example above, you may clear up through Faction Champions on Heroic, then swap to Normal for the Twin Valkyr encounter, and then swap back to Heroic for the Anub’arak encounter. Please do note that once you swap to normal mode Trial of the Crusader and kill a boss, or wipe during an encounter, you will no longer be able to complete the Tribute to Insanity that week in Trial of.
Read more on wowhead.com