Last but not least the developers at Blizzard revealed on April 9, 2010 the Cataclsym changes for the class of the Death Knight. With the World of Warcraft expansion Cataclysm tanking Death Knights will be forced to choose the blood talents after the high amount of flexibility in the Death Knights talent trees of Wrath of the Lich King didn't seem to work to well. Also the developers want to change some mechanics of the rune resource system Death Knights use to make it more flexible. Additionally new abilities, mastery skills and talent changes will be implemented with Cataclysm. On getbuffed.com you'll find all information and clarification on the changes to the rune system.