Had a fun talk with guildies on this earlier! Considering how many secondary stats have come and gone in WoW's history. Hit Rating, Expertise, Armor Penetration, Spell Penetration, "Resistances", and of course the currently present still Haste, Crit, Mastery, Versatility, etc, and some other ones that incorporate some diablo-feeling elements like leech and multi-strike.
You have all these secondary stats that seemingly cover every area possible, yet you know blizz isn't at the ends of its creativity. So if there was to be a new secondary stat introduced, what could it be? It can be either PVP or for PVE.