No idea, I posted about it myself.
My Plate wearing alts have 1-2 pieces of world boss loot ready to go.
My Cloth alts have the same.
Leather wearers are all converting their chest, except my Monk who didn’t get that drop yet.
Hunter and Shaman are just sobbing quietly to themselves.
edit -
World boss loot has always been kinda random who gets what but this is the first time it has had the potential to provide so much power.