The change to a queen and sleep sofa was made in response to guest comments. Many couples use studios and find the sofa a nice addition. The cost difference was not really a factor - the sleep sofa certainly does provide more usuable space when the sofa is not opened up.
OKW is the only
DVC resort with the 2 queen layout- all others, including HH and VB, have 1 queen and the sleep sofa in the studios.