Okay to preface this I like where Elementalist is right now well done.
Elemental Hammer and Elemental Annihilation.
EH is now less useful I used it empowered before the change but now I have to have high focus to get that bonus so I stand by the fact that firebrand is better due it doing 90 damage 45 on a save.
EA. is same as before.
Elemental overcharge/savant.
It's main use is for emergency casting of your best spells to burst down a boss spawn if your low on focus.
I feel it's to short a duration now and I find myself generally not bothering or just forgetting all about it.
Where as before the change it had a longer duration and was the first action in a boss fight, activate it and run up and blast away.
Focus Cost.
The increased focus cost on spells seems fine and the reduction for element themed spells is a great bonus and does make them get used more often.