At exactly 11 months out from date of arrival, a resort owner can book up to 7 nights. To get to nine, the owner can wait two days after making the original reservation and then add the two nights. Alternatively, the owner can just wait to two days beyond the 11-month window and reserve all 9 nights at once.
As to getting either BCV or BWV at 11 months out in May, it will depend, of course, on whether you can find an owner who can make a nine night reservation and on availability.
As to availability, as long as you can find someone to reserve BCV not too too long after the 11-month window opens, you should be able to get a studio, Studios there tend to book full before other rooms, but even studios for time in May are usually still available to reserve at least a couple weeks beyond the 11-month window.
At BWV, that is also true for any pool/garden view studios. In fact, those even have a chance of being open at 7 months out when owners of other resorts can reserve BWV. However, if what you want is a standard view studio, there is substantial risk of not even being able to get it at 11 months out. Those often book full within seconds after the 11-month window opens and many BWV owners fail to get them as a result. Boardwalk view studios may also fill fairly quickly, although for that time of year, they tend to still be open at least a few days past the 11 month window.