I do not know man, but I am pretty excited for DF, because it seems that it would just let me play without annoying fucking systems. Just fucking let me play.
I enjoy the world, let me go through new zones without having to earn conduits, and legendaries, and without another stupid table of followers (my God, so happy that they have not make one for DF).
Plus Dragonriding seems very cool, dungeons and raids are not my thing, but they are always good. Art is always good. Reputations seems more interesting with a more varied open world content. It seems that I would be able to expend hundreds of hours on proffesions vs current ones (just level them and meh). I actually think that I might become very hooked to proffesions.
Plus, the most important thing my friend. Content. Content patches. WoD and SL were a failure for the lack of it (among other things, SL especifically was so stupid in so many aspects that I cannot believe how they made that fucking piece of shit)
I believe that DF will have the best post expansion launch content of any expansion. Why? I do not know, I might be reading too much between the lines in the interviews made to Blizzard, but I think that they will really surprise us in this regard.