Blizzard
Over the next few weeks, we’ll be jumping into 7.2’s new PvP Brawls on the Public Test Realm, and you’re invited to join us!
Several members of the World of Warcraft development, quality assurance, and community teams will be queuing for PvP Brawls between 3 PM and 5 PM Pacific (6 PM and 8 PM Eastern) every Friday, starting on February 3rd and continuing through February 17th. If you’d like to join, simply log into the PTR and queue for a Brawl during that time.
Blizzard employees will be identified in game by their guild (either <Blizzard Alliance> or <Blizzard Horde>). We’re looking forward to having you fighting alongside us -- or sending us to the graveyard -- in the Brawls!
Blizzard
What you're seeing through datamining regarding these items right now is EXTREMELY unfinished -- that's why we haven't enabled them for testing on the PTR yet, and currently don't plan to for at least a couple weeks. I wouldn't take their current state as anything more than "there will probably be some Legendary items obtainable through crafting."
They should make a lot more sense once they're in a more fleshed-out state. I'd love to be able to share more details now but, frankly, they're so early in the design process that most of the details don't yet exist.