From the WoW.com coverage of the Cataclysm expansion preview panel
1:31PM Heroic Deadmines and Heroic Shadowfang Keep. Existing art, but new fights, creatures and abilities. Heroic level 85 dungeon. “VanCleefier than ever before.”
Yay for more VanCleefiness!
[Addendum: There is a list of the current Cataclysm 5-person dungeons on WoW.com.]