I'd go more by what Blizzard has done historically than a leak in any case, because Blizzard hasn't deviated from it's design patterns much. They just shift them around. It's completely possible covenants will be changed, but I personally don't think they will. I think they will change the name, maybe dragon sworn or dragon oath, and tweak the system so that it doesn't resemble anima grind for cosmetics, gear, ect. It's probably important to remember that covenants were the idea Blizz had for single player content along an expansion, it's their system on hooking the average player, not a committed raider. So, in one way or another I think we get a similar system, but with a facelift so it doesn't resemble it, but the underlining is the same.