This is yet another HUGE change coming to the Cataclysm expansion with a lot of stats being changed or totally omitted from the game. The main change which will reflect every single class would be Stamina.

Also they are introducing a new melee Legendary weapon named Shadowmourne. Back to the good old Molten Core days I guess.

Here is the video taken at the recent Blizzcon to guide you through each aspect of the item and stats changes coming to the expansion.