What we can all expect to be nerfed from the ARC/SMN/SCH are
Reduced HP/Stats of any Fairy/Egi, so you can actually kill the pet with less problems than it is now.
Another thing which can be nerfed is the way to get "Aetherflow" stacks ...
Revitalize is by far too strong and too spammable in contrast to Benediction of WHM.
Healing Reduced Effect of Miasma/Miasma 2 will be definitly nerfed for only pvp purpose.
Before you even start to say it won't be nerfed, SE already said not only ACN/SMN/SCH will be adjusted for pvp.
Other Classes will be changed too ^^.