Here come some Wrath Classic improvements, with a couple of class changes and a Yogg-Saron fix!

June 20 (Source)

Wrath of the Lich King Classic

Classes

Mage

Ice Armor should no longer fall off when players have either rank 1 or rank 2 of Frost Warding.

Warrior

Blood Frenzy should now fall off when Deep Wounds falls off the target.

Dungeons and Raids

Ulduar

Yogg-Saron

Guardians of Yogg-Saron will once again spawn normally during Phase 1.