My guess too as Sweetpea said, is that it will probably be December 2nd thru the 9th, so you should be safe. We are going the end of November beginning of December and will probably overlap a couple of days, which we did in 2004, and it wasn't that bad, though I think it depends on where you are staying, because I have heard issues with the kids up late, and the busses being an issue. I believe that most stay at the All Stars and also Port Orleans.
They usually don't announce it till later in the year.