The earliest I have heard special rates out for are three months in advance. Oftentimes, the special rates are released with even less heads up time. For example, the special July rate was just released a couple of weeks ago! If you want to see the historical data of when codes have been released in prior years (from 2001-2004) check out
www.mousesavers.com. Click on the FAQ on the left side of the screen and move down to the historical trends section. She lists what kind of codes were released and when for which time periods, but she does not list the amount off because that is always fluctuating. It is helpful to see when things were released in previous years.
We are going to WL in Feb. The CM told me to call back in late Nov to see if there were any AP rates available, but I will continue to watch posts and mousesavers to get a jump on it as soon as they are available!
Good luck, and happy planning!
And yes, Ft. Wilderness is usually included in the AP rates. In fact, this past Feb. there was a rate code released that was only good for Ft. Wilderness--it was not an AP rate, but a rate that was good for anyone! So if you don't already have an AP, watch for the codes for room rates and AP rates and do the math on if it is worth it to purchase an AP (unless of course you will be returning to WDW within the year so you can keep using the AP). I hope that makes sense -- if not, let me know!