Yeah, it planned for December, but the files from the New York printer were a mess so it required proofreading that wasn't in the original schedule, so now it'll be out in February. This one is from Lonely Road Books, by the way. Here is the update:
http://www.lonelyroadbooks.com/news.html
"The Exorcist: The 40th Anniversary Revised Limited Edition by William Peter Blatty was sent to the printer at the end of September 2012. Printing will take about eight weeks and the slipcases for the Limited Edition will follow approximately eight weeks after that, so we're looking at a February 2013 publication date. Traycases for the Lettered Edition should be ready in the first half of 2013 as well."
Brian