RNmomnFL,
You must have gotten lucky last year. I got a ressie for this year's T-giving also but made it on 12/21 (nearly a year in advance as Stacktester recommends). At that time all that came up on the on-line ressie machine at the WDW website was a partial (loop 1500 or 2000) which fortunately was all I needed since I have a pop-up. In planning in the month between last year's T-giving and when I made the ressie, the on-line ressie machine had been showing all types of sites then fewer and fewer types until just the partial showed up.
Central Res may be releasing capacity in blocks or it may really be full but keep trying to get in. Cancellations will happen and you may only be able to get a day here, a day there, but if you are diligent you may be able to piece your trip together.
Keep trying - others have been able to do it so it does happen.
Bama ED