Board Thread:Game Discussions/@comment-25954793-20150609230005/@comment-24571313-20150610132738

Most likely at the end of Heroic either Thursday next week or the week after that.

My best guess would be, armor of the peacock (Water/air), then Undead Robes (Spirit/Earth).

They are the next two chest epics in line and neither of those elements have been released during heroic mode yet.