Yes, after the rehab, the BWV studios will officially sleep 5. Once the rehab is complete (should be in a few months), the booking engine will be updated to allow 5 for all views. Currently, only the Pool/Garden category will allow you to book 5. Many have reported that they have already been assigned to a rehabbed room and one of the party used the murphy bed.
If BWV is your choice, no need to worry about its studios - they will accomodate 5.