I put Thanksgiving in on the search link on this website and found a listing for all the places serving Thanksgiving lunch and dinner a few days ago. I will tell you that I called Disney Dining earlier this week and most of them are already booked - forget about Chef Mickey and LTT. The few I found availabe were Trails End at FW, the Grand Floridian Cafe and the Yacht Club Galley at the Yacht Club. I was looking for 4 adults. We were looking for a late lunch (around 2 or 2:30). We booked Yacht Club Galley. It says a Traditional New England Thanksgiving Buffet Feast for 28.99 for adults and 11.99 for 1 - 9. The few other places we found availability at were not until after 8:30 pm.
I would suggest calling ASAP and trying the three that I mentioned above.
Linda