All I can say is try....we got BCV this past May but it was during the second week of May (for 9 nights), not during Memorial Day weekend though. Your best bet (and it worked for us) is to make sure you are on the phone with MS right at your 7 month mark at 9am on the dot. We did this same thing for our upcoming January trip. Good luck and here is some for you....hope it works out in your favor.
I called at 9 am at the 7 month mark for May 14 and was told there was very limited availability for a 3 night stay in a studio. I was surprised as I have not had trouble reserving BCV in the summer and thought May would be easy to get.