I have been to WDW 2x's the week before Thanksgiving and we always see X-Mas decorations. We were staying at the GF once and were able to watch the tree being put together as well as the Gingerbread house. We saw decorations at the CR, and WL and BWI, but we didn't get to look at the YC/BC. We were also able to do the preview of the Osbourne lights b/c we had AP's. This is our favorite time to go because when you get there it is not decorated and then over the week you get to watch it transform. I still have the "newsletter" they give you at check in at the GF and last year they started putting the tree up on Nov.13th and the gingerbread house on Nov.12. By the time the big tree went up there were already decorations throughout the resort. Hope this helps alittle, sorry I didn't know specifically about the BC. You will love this time of year, especially with the great weather and low crowds!