Guillermo Del Toro was quoted to saying:
Del Toro said his film will be a scary 3-D, live-action take on what he called “the most precious real estate on Earth.”
“We're making it into an e-ticket ride,” del Toro said. “It will be scary and fun at the same time.”
This info is from movies.yahoo.com:
The new movie will be true to the “spirit, art and aesthetic” of the original Disneyland Haunted Mansion, where del Toro has made an annual pilgrimage since he was 3.
You can read more about this announcement on these sites:
http://www.movieweb.com/comic-con/2010/news/sdcc-2010-guillermo-del-toro-directing-haunted-mansion-3d
http://movies.yahoo.com/news/movies.ap.org/guillermo-del-toro-direct-new-haunted-mansion-ap
http://www.wired.com/underwire/2010/07/guillermo-del-toro-will-rebuild-disneys-haunted-mansion/?intcid=postnav
Here is a teaser image that was shown at Comic-Con: