That week has become our standard vacation week because the kids are out of school and it's not a crazy time for DH at work.
And:
-the weather's fantastic (the chilliest November we were there, we did wear sweatshirts during the days, but we still had on shorts and managed a bit of swimming)
-the crowds are not bad until the Tues or Wed prior to Thanksgiving (we try to go at the end of the week before and get our park fix in)
-The Christmas decorations are up (or going up; a few years ago they seemed to be behind schedule at some of the resorts)
-The Osbourne lights are on at MGM--get there right at the time they flip the switch (I think it's 5pm) and it will amaze you and be "snowing"; it's really cool
As for your Grand Villa hopes, that seems very doubtful to me. I'm a
DVC owner, and don't have the family/friends to probably ever want a GV, but even I know they pretty much go at the 11-month window, especially for a week like that. You'll probably have to come up with a few other bearable room configurations and hope for the best.
Yes, you can get a traditional Thanksgiving dinner--many of the restaurant have special Thanksgiving menus--but you should call at 180 days out just to be sure.
I shouldn't rave about this time of year at Disney so much. . what was I thinking, anyway??
Oh well, good luck and have a great time!