It would actually be a good twist if they show that Ankita is actually Pia, Ovi's daughter. But the problem is why would Ovi's daughter be living with Soham? Then again, maybe Soham/Varsha kidnapped Ovi's daughter for money/financial help/route from Arjun-Ovi to escape from police, and didn't return the baby later, meaning to use it as a safeguard?
She could be shown as the final link in the whole story, the one who comes to know the whole story, Arjun's side, Ovi's side, Purvi's side, and clears her mother Ovi's name and blasts the Deshmukh family, gets Soham punished and takes care of her siblings.
Soham's backstory in this 20 years, his journey from a goon Romeo to a useless good for nothing and cold hearted guy, Ankita and her siblings mother, disappearance of Varsha- all these are questions that we will be answered in the upcoming episodes I guess, or so I hope. For now, it seems the CV;s are building the story step by step to maintain the curiosity factor.