I am thinking the same.. I think they will get engaged & start to get close to each other & be on the verge of expressing their love, when shyam's turth will be out & Arnav will leave his Kushi for his sister's kushi & then Arnav will realize that what ever fate he is writing for himself, devi mayya is making him right it but as Kushi said she will not be there when he realize that.
Then after Anjali recovers, she realises his brother love & She along with payash will try to bring them together again