In all difficulties of the Lich King encounter, players who are tanking raging spirits are no longer valid Harvest Soul targets during phase 3, Vile Spirits in phase 3 now spawn at a greater height, and Vile Spirits in phase 3 will not be spawned as often.
In the 10 player Lich King encounter, Raging Spirits have had their health decreased in both normal and heroic versions and then fewer Vile Spirirts will be summoned in just the 10 player normal mode.