Neev is going to used as a spare for later on if he stays on with Balaji. But its pretty much guaranteed that there is not going to be reconciliation between Neev & Prachi. It now seems pretty obvious that the 'everlasting love' in the initial summary of the story now refers to Michi. (Sorry if i offend NP fans!!).
Its not surprising they killed off Ayesha. Her character did not have anywhere to go except for a Neesha track and I don' think the creatives wanted to persue this which is unfortunate. If Michi can change from loving their childhood sweethearts to someone else...it could have worked for Neesha as well!
I don't know why it has to be Kolkata. Does SS have affinity with this city. I read that Bani ended up there also... posing as a Bengali girl.