Image: Copyright 2006 Walt Disney Pictures.
Trailer available at this link.
Image: Copyright 2006 Joel Fletcher
For a taste of what the film might look like, be sure to grab your red and blue anaglyph 3-D glasses and check out Joel Fletcher's The Nightmare Before Christmas 3-D photo gallery. Joel was an animator at Skellington Productions and worked on the film.
Sources: Aint It Cool News and Cartoon Brew.
