I have read some very interesting opinions from you all on this forum. I would like to share what I think might happen. First I will talk about the precap and assume that it's not a lollipop and that Dev has indeed seen Jatin Suhana and Sonakshi together. He will figure out that Suhana is Devakshi child and would be super emotional and thankful to God for this miracle. He will recall the unknown attraction scenes, like homework, class recitation etc. He will then also remember his Shimla night and doctor stress test and naturally conceiving statement. He will be very upset and angry with Sonakshi for not sharing this news with him and will recall their child talk flashbacks. He will feel tremendously hurt.
He will not reveal anything to anyone, and continue to bond with Suhana. He already knows and thinks that she is looking for her dad and will be furious as to why Sonakshi has not told her yet. Little does he know that Suhana hides from her Ma just like he did. Initially his aim will be to bring Suhana so close to him that later he will win over whenever there is any confrontation or custody battle. He will not think of reconciliation with Sonakshi and will think that Sona wants to settle with Jatin and that's why is hiding or not introducing him to Soha. His lawyer will talk about having a wife to better his chances at custody. Sonakshi will not know or rather Dev will keep the info from her that he already knows about Soha. Soha will also attach with Dev without knowing that he is her dad. She will tell Sona about this nice uncle at school but Dev will never meet her. He will drop the custody bomb to hurt Sona even more and to snatch Soha just like she thinks he will. There would be lots of manipulation and court will give custody to Dev for a few months. Sonakshis worst fears will come true and she will be heart broken . Dev will taunt that he did all this to make her realise how much it hurts to lose a child and to not know about the existence for years! He will not separate or traumatise his Soha and will take the high road and leave Soha with Sonakshi. Sonakshi will mellow down and realise her fault and will talk her heart out in front of Dev. They will clear their misunderstanding and Dev will accept his mistakes in front of Sona. They will patch up and will get together and then together they will redeem Ishwari.
Please comment if you also think something similar might happen.