I went last Thanksigiving (2008). There were no menus put up until about a month before leaving for vacation. I had to use 2007's menus to get an idea of who served what whan I made my ADRS for dinner.
Ill tell you this though.....maybe due to economy, maybe not...the place was EMPTY until the next day. On Thanksgiving day itself, every attection was walk-on and every restaurant was about 1/2 full...if that. You will not have a hard time getting your reservations.
We ate at Citricos in the Grand Floridian. Although the food was good, the portions were the size of a pea. Im not a big eater, but I like a little feast for Thanksgiving! Especially since we had Thanksgiving dinner at 2:00pm and did not think to reserve a real dinner spot assuming we would be full like we are at home. but, like I said, the place was empty and we just walked into the Wave that night for dinner!
Good Luck and Enjoy!