Just to clarify -
At BWV, the studios all have 1 Queen bed and a full/double sleeper sofa. There is also a Pac 'N Play portable crib in the closet.
There are a limited number of "studio plus" units scattered throughout the resort. These units are often referred to as dedicated studios. The dedicated units do not have a connecting door arrangement to a 1 bedroom unit. Instead, they have a small (approx 5 feet long) daybed in the space that is normally occupied by the connecting doors. As mentioned, there is no guarantee than a request for one of the dedicated studios will be granted. (My understanding from MS is that the room assigners do try to give parties of 5 priority for these units, but that it is not a good idea to count on getting one).
The daybeds are also rather narrow and IMHO, they are only suitable as a bed for a young child. They are not the same size as the daybeds found in the monorail resorts!
Occupancy limits are the same for studios and 1 bedroom units - 4 persons plus a child under 3 (who can use the porta-crib).