Sorry to say but you shouldn't buy the AP in the hopes of getting a room discount. While it is possible, it is still just as possible that you won't get a discount too. They may not offer them, limit the resorts that the discount is avail, the dates and so on. It should be bought for admission.
With that said in 2003 rates for Nov came out at the end of August.
2004 was the same
2005 was the same
So you have a good almost 2 months left to wait.