Everything I’ve heard indicates they’re going to leave Blizzard to their own devices. Which is, in theory at least, an improvement from Kotick (who was the one pushing for microtransactions in everything). Actual developers usually don’t want that garbage. In Bethesda’s case it made no difference. In WOW’s case it will probably be a slight positive for those reasons.
Another thing they will do that will affect WOW indirectly is severely changing both HR (getting rid of the really bad “certain % of employees get a low performance review” system) and actually paying people fairly.