Legendary PvP weapons, armor, mounts, and hunter pets.
-1H swords of L'oGosh
-1H fists of Kargath Bladefist
-Staff of Medivh
-Lord Uther's 2H Hammer
-Poleaxe of Mannoroth
-Shackles of Vol'jin
-Cloak of the Banshee Queen
-Alleria's Leather Jerkin
Bindings for recipes "could" chance drop off of bosses in Battlegrounds, off of other enemy players, outdoor NPC Mobs, and the final piece drops from a faction leader.
Unlocks a new "legendary" Battleground once X amount of bindings/gear is collected.
Legendary Mounts "can" include [but not limited to]: Instance Bosses e.g. Mount Neferian Himself, Large Wolf (covered head -> toe in armor, spikes, chains; red eyes, blood dripping from mouth, growling sounds), and yes even Druid forms! (Who wouldn't want to be a wisp, dryad, or furbolg).
Somethings could chance drop like Twin Blades of Azzinoth wheres others crafted like Thunderfury.
A WoW lore character "finally" enters the PvP playing field (or so it appears to be!)