For new purchasers, only BCV is available at WDW; HH and VB are also still available. If you buy BCV, it is a "pre-sale" as resort does not open until August and you cannot use any points except for a trip that begins Aug or after (even at other DVC resorts).
If you bought resale, you can possibly get BWV, OKW, or even VWL. However, you would not be able to call and reserve until after you close which usually takes a month after you sign the contract. Thus, if you bought today, you would not be able to call and reserve until sometime in mid-March at the earliest, four months before your planned trip. members can reserve 11 months out at home resort and 7 at others. Regardless of length of trip, no real problems when booking 11 months out; can be problem at 7 particular for higher demand seasons. By the time you get to four months out it gets even more difficult to get a room. However, during summer, one of the lower DVC demand seasons (DVC demand does not equate with Disney in general demand), you can sometimes find rooms at least at OKW even when booking late.