Farm the equivalent of heroic mechanic
There were a few good points mentioned about itemization. The major announcement is that heroics will be on another Lunia gold tier from normal instances that should be flat out better than doing a harder instance and getting the same loot as the normal instance gives. There is also a new badge currency called emblems. You will not have to farm the equivalent of heroic mechanic in order to gain all of your emblems. The harder the instance then the better the emblem it will drop.