Will Karan get revenge from Pooja by beating her up?
One of two things might happen - he might beat her up or he might play a cat & mouse game with her initially making her think he has changed & then when she least expects it, he might strike with something hurtful again (like how he broke up Priya's engagement - he was nice to Pooja before that).
Will Pooja submit another complaint, and make sure Karan stays in jail?
She might lodge another complaint or simply walk out on him.
Will Pooja divorce Karan soon?
She might stay separated from him for a while before taking the final decision to divorce him
Will Karan accept his mistake so soon?
Karan is the sort of person who will never see anything wrong with his behaviour, he might pretend to accept his mistake but he is going to go back to his old ways.
Will Pooja stay strong if Karan goes to jail again?
Perhaps this time after seeing that he has not changed at all, she will stay strong. I certainly hope so!