Why do I think that it would be divorce instead of martial rape?
He will divorce her.Remember woh dil se utar jaye wala dialogue.Meerab will throw her jewellery etc.He will get pissed off and say even if u have given me any rights.I would not take it from a girl like you kyuki tum mere dil se utar gaye ho.Then he will say divorce.bit then he will realise what did he say tu in anger he will destroy the room.
I have noticed one thing in the promo meerab was sitting exactly at the place he pushed her before closing the door.
Then he will change and leave the place.Later when he will come back tu maa begum will ask for meerab then he will say ka I have given her divorce.Maa begum will slap him.
Then he will search for meerab as the member of khan family.Remember woh saba ka ghar p tashan mein like starting wala MK ban kar jata hai kyuki now he has let go off his second chahat as well
All the dialogues he said tum mou ka bal giroge applies in this case as well.