Monday, October 26 at 7PM EDT / 4PM PDT – Festergut
Wednesday, October 28 at 7PM EDT / 4PM PDT – Icecrown Gunship Battle
Thursday, October 29 at 7PM EDT / 4PM PDT – Sindragosa
Friday, October 30 at 7PM EDT / 4 PM PDT - Valithria Dreamwalker
Tuesday, October 27 at 19:30 CEST – Lord Marrowgar
Wednesday, October 28 at 19:30 CEST – Lady Deathwhisper
Thursday, October 29 at 19:30 CEST – Professor Putricide
Friday, October 30 at 19:30 CEST - Rotface
A little bit of analysis about the schedule after the break.
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.
As you can see, Blizzard is going to re-test some encounters, including the Gunship battle, Marrowgar, Festergut, and Rotface.
The four new fights were all mentioned in the Icecrown raid preview -- Sindragosa is the big frostwrym seen on the login screen that Arthas summoned in the Wrath cinematic, Valithria Dreamwalker is a green dragon that the Scourge has been doing some experimenting on (that doesn't sound good, but keep an eye out for some Emerald Dream teasers), Lady Deathwhisper is the Supreme Overseer of the Cult of the Damned, and Professor Putricide oversees the Plagueworks. He's the creator of Rotface and Festergut, and his fight will probably be a gross one.
Look for our impressions of these fights later this week, and if you're looking to test any of these yourselves, better roll on over to the PTR. As always, this schedule are subject to change at any time without notice. Such is life on the Public Test Realm.