I honestly do not know.
Some of the specs and classes I have enjoyed since late Vanilla just feel odd and naked.
I have been quite vocal 'bout them not doing a good job in prunning too many skills from specs. I will need to do some testing b4 I am even sure, that I will buy Legion.
The world seems like awsome, after WoD there is once again a reason to leave your Garriso... I mean Order Halls, since they are totaly different *cough*, but if the gameplay is lacking badly, the good world will go to waste.
Keeping my thumbs up, that they will do a lot of tweaks b4 release.