From disneyland.com:

"Disneyland park's annual "Merriest Place on Earth" holiday celebration kicks off a little early this year, thanks to the fantastic new Haunted Mansion Holiday attraction in New Orleans Square. "Tim Burton's Nightmare Before Christmas" teams up with the world-famous Haunted Mansion October 5 through January 6 to bring you a fantastic revamped attraction (courtesy of main character Jack Skellington's creative mind) - and a whole new reason to make the Resort your holiday haunt this season."

My ghoul friend Heather & I visited Haunted Mansion Holiday at Disneyland last Halloween...we thought it was quite fabulous! Here are some of Heather's photos: