I'm neither a good fury nor a good arms player. But as far as I know both specs probably get even more balanced dmg wise then they are at the moment. One spec = PVP other spec = PVE is wrath thinking. Blizz tries to get all specs viable for both. Sure they have not succeeded everywher. But the point is: Spec (if not completely broken) are much closer together than before. So player skill should be count much more than the theoretical difference in both specs. And arms has more utility. Some of it beeing usefull in raids, too. (At least mobility is better.)
If they do ok values with arms, chances are that their fury values would not be higher for at least some time, until they have learend all about fury. At least that's what I see out there.