Honestly, I have found the Vecna unleashed quests long and drawn out, so tedious to play thru, it was brought in with such a large number of quests and sold during a hardcore for favor hunters. It as a whole seemed to be not well received otherwise and they are still trying to sell it when i personally already have told people i know that dont have it to wait until it comes on for 99 points because its content you will rarely run. The quests are too lengthy and the rewards are not impressive.
I expect myth drannor to be much of the same, although it will likely have some super grind for end game players to work at to get some extra form of power, which will entice that crowd. Maybe something similar to the old green steel weapons, or maybe dino weapons, or maybe even worse like the cursed cards(this would be my vote especially if it is power that end gamers wont be able to ignore, i love watching them grind and complain, lol). Whatever it is I hope they implement a system where none of the power advancement can be cheated by duping, make them grind hard.