Out of everything datamined today, this is the most interesting and exciting to me:
It's about time we got an item that gave all classes heroism. There are other ways to make classes unique than giving only 3 of them the ability which is basically a mandatory tool for every serious raid. No longer will you have to invite at least one shaman, mage or force your hunter to go beast mastery. Bring a few of these babies along and it's just as good!