I'm surprised nobody has mention this yet, so I will. Quoted from the D23 Twilight Bark:
11.13.09 — I Think I Can, I Think I Can! Casey Jr. Circus Trains and Storybook Land Canal Boats at Disneyland will reopen on November 20 with Holiday décor, including miniature holiday trees, lights and wreaths decorating many of the houses.
SO it seems that in addition to standard maintenance Casey Jr. and Storybook Land have also gotten a slight holiday overlay. I wonder if this will be a year-round thing from now on.