This season it's scheduled to go down for the overlay removal on January 18, 2006. At that point the Haunted Mansion will undergo a refurb until March 5.
I'm probably the only one who doesn't really care for this overlay. Too "neon" looking for me. I like the original much better. The wreaths outside are very cool though.
I think it's a nice change even though it's only there for a short time each year. We've actually attended the event that kicks off the overlay being there. It was a lot of fun!