There would be Legendary Weapons in the coming version, player can get them by defeating the highest level creep, or grab take the only one from the neutral shop before other players. For Alliance and Horde they can buy one kind of Legendary Weapon from the base with very high price.
Legendary weapon does not only has high properties, but also some unique and interesting features: "Fangs of the Father" will bring the hero a pair of black wings, "Thunder Axe" will summon spirit wolves during battle, and the "Dragonwrath, Tarecgosa's Rest" will summon the mirror of Tarecgosa, a blue dragon to fight for you.
WAH 2.0 is under the last testing, it will be available in 3 weeks:)