it is quite possible that ekta is following the original story of the novel.....and pia/pushkar and jai/bani will land up in misunderstandings.....and will separate......but i dont think that jai will ever get pia pregnant.....doesnt go with his style or character.
and i also feel that jai and bani will just separate but never ever divorce......bani still wears the mangalsutra and sindoor.
ekta knows vey well how everyone likes Jai Walia's character and she also knows that no one will accept him betraying bani or the very own character of Jai Walia.
infact what i feel is that jai and pia's relationship will reach to a very hight level but then as soon as anything of the sort is about to or can happen........jai will relaise his folly and will leave pia and go back to bani.