By example ...

TODAY
Salary = 10,000 QR
Expenses = 5,000 QR
Savings = 5,000 QR / 3.63 = 1,377 USD sent home

AFTER FLOTATION
Salary = 10,000 QR (typo corrected)
Expenses = 5,500 QR *some things are bound to go up in price
Savings = 4,500 QR / 2.63 = 1,711 USD sent home

You could use other figures, but the calculation is valid for whichever currency you choose. It is likely that if you're earning QR then you'll be able to send home about 25% more cash after flotation.

There are TWO groups of private people who will not benefit;
a) People earning foreign currency here - for example American servicemen ... they'll have less QR to spend at the weekend (who know - mebbe there'll be standing room in Rydges again?!)
b) People investing in the Pearl, etc. from abroad - as they'll have to spend more of their domestic income to buy here. This may have a (small) effect on real estate values here (it would probably have more effect in Dubai)