I certainly would get my reservations made now. The DVC club is rapidly expanding with more new members every day. While it would probably be safe to wait until October, why put it off and worry about availability between now and then. If you wait until November, the enitre DVC Community will be allowed to book Wilderness, not just the Wilderness owners.
I have Wilderness points available. Let me know if I can help with your plans for next May. docdds@aol.com