As long as you don't need to borrow some of next years points, you should be able to book March 6th, for a cruise starting after August 1st.
If you're going to need to borrow (like we are), you'll have to wait till closing to borrow those points and book your cruise. Closing is scheduled for June 1st, but since this is a Saturday, June 3rd is more realistic. Also, there is no way that all the pre-sales can close on the same day. These have to all be taken to the courthouse to be "closed", and I'm sure there's a limit. So it may take a few days to work through the back log.