If you have a Snelgrove board or a double screen board
http://www.betterbee.com/products.asp?dept=302
Move all uncapped brood and frames of honey and pollen.into one super. Shake all the bees off into the lower box. Place a queen excluder between the supers. Wait a few hours a majority of nurse bees will move into the upper super to tend the brood. Remove the queen excluder and replace it with the Snelgrove board. Perform this a day before you introduce the new queen, this isn’t enough time for them to get real serious about raising a new queen. The old queen will continue operating in the lower box but will be separate form the new queen. The colony will be acquainted with both queens because of the screen board.
When the new queen has been properly introduced and is laying, find the old queen and remove her form the hive and rejoin the supers. The bees will accept the new queen, conditions are probably similar to normal supersedure.
A good advantage is there is no delay in brood rearing when queen introduction don’t go as planned.