Phase 2 “Secrets of Ulduar” is now live for NA Realms on Wrath of the Lich King Classic! Below is a summary of all the changes that are live, as of today.
Titan Rune Dungeons
Titan Rune Dungeons are an entirely new mechanic that did not exist in original Wrath of the Lich King. Blizzard is implementing this new feature as both new content and as a catch-up mechanic.