His post on the official forums has scheduled the following encounters for testing on the Patch 3.3 PTR, barring any unforeseen difficulties, including build changes, server status, or capricious developer whims.
Friday, November 6 at 7PM EST / 4 PM PST – Valithria DreamwalkerSaturday, November 7 at 4PM EST / 1PM PST – Icecrown Gunship Battle
Friday, November 6 at 19:30 CET – Lady DeathwhisperSaturday, November 7 at 19:30 CET – Professor Putricide
Patch 3.3 is the last major patch of Wrath of the Lich King. With the new Icecrown Citadel 5-man dungeons and 10/25-man raid arriving soon, patch 3.3 will deal the final blow to the Arthas. WoW.com's Guide to Patch 3.3 will keep you updated with all the latest patch news.