I also feel Nisha has something to do with this. And Agni has not shown to be there in the promo anywhere (unless I missed it?) So, either Rahul has been hypnotized, or it is someone else in Rahul's guise (maybe Agni's mother?) who murders Maanvi. Then a rebirth: Maanvi comes back with revenge towards Rahul. And we get to hear the word Ghatiya again!
So this show is also going to undergo a leap: after the leap, maybe they will show Rahul married to Avanti. And Maanvi will be the third love angle...I am not watching this one again.
Agni not being in promo hints at him but then if Maanvi is going to come in new avatar for revenge will she not be recognized easily if she is with Agni? Agni's mother is another possibility. Maybe Agni dies and she takes Rahul's avatar to kill Maanvi to make her believe the man she loves and did so much to protect is one to take her life. In promo stabbing scene was shown in house/storeroom not nearby any cliff maybe that was for just promo and we might see stabbing falling off cliff assumed dead by all in episode.
I doubt Rahul will be shown married to Avanti maybe engage to save his family from bankruptcy? Sabarwal family image got tarnished because of Harsh newspaper article and noone came forward to offer them help during fire incident.