I have very strong feeling that they will show Pragati as Bani.
Now if I recall.. Many a times when RM met Pragati he remembers him moments with Bani.
Pragati when enters house after marriage started seeing Bani's scene of that accident days.. That's actually her subconscious mind which is remembering what she has forgotten but when she is in house old incidents starts haunting her and she thinks it is aatma.
Also RM falling for Pragati means that even if the face has changed he has fallen for his love.. It was Bepannah pyaar.. So irrespective of any identification he falls for her even if Bani is so much within him.
CVs have not shown much of Bani RM so we are attached with Praghbir chemistry.. If analyzed in other way... He again fell for his love irrespective of her identity known..
This is all my speculation.. Let's see what they show.