4 yr old is hitting teacher and not listening to anyone?

Honestly, that's not normal behavior and unless he's been abused sometime in his life, he may have a form of something that needs medical professionals to diagnose and treat. I think you will have to wait and see what the behavior specialists say, I'm really sorry you are going through this. Your son will hopefully be alright, he is just out of control at the moment and you need to regain control.