if they show they are moving out of the city , then I am okay , but in that case Viaan should not know to keep Aarav and Viaan away , and Viaan will find her after finding what happened !! I hope the track is this that before Viaan reaches to Katha , she disappears to new city and Viaan finds her as per foreshadowing.
If the new set design is said to be somewhere outside Mumbai , think it should be good . Trusting makers , no illogical writing and not butchering characters and keeping logic in the show. Hoping Katha does not have romantic feeling towards new guy . She must know she keep loving Viaan from her heart . This is their test of love . Sometime when people doubt that you are not the one for marriage material for their son , then somewhere you need to prove it .