Are you wondering for March 2008? Do you own at BWV?
If you own at BWV, then call and make the reservations ASAP. They might already be full.
If you do not own at BWV, you can call and make reservations at your home resort (so you at least have somewhere to stay) and then call the day the 7-month opens up and waitlist at BWV (assuming that nothing is available there when you call).
If you can tell me your dates in March, I can look up the estimated crowd levels for you in the Unofficial Guide. I can tell you that from March 9 to March 31 the crowd levels are projected to be at some of the highest levels (ranging from 8 to 10 on a scale of 10). The crowd levels range from 5 to 7 during May with a couple of 8s popping up at the end of May (around the holiday).