I do not call a CD loaded up with a buch of pop songs that are not even in the movie to be a 'soundtrack'. A soundtrack is a CD of the music that is IN the movie, not music 'inspired by' the movie before the movie is even done.
I saw the preview of Narnia in a theatre last week--it certainly looks to be a visual treat, althrough the beginning was a bit jarring. In the books, the professor was no sort of grumpy tyrant would wouldn't let children play--Mrs. McReady was not a Wicked Stepmother.
The CD is only called a "soundtrack" by this article and some retailers. The actual CD doesn't make a claim that it is a soundtrack - just that it is songs inspired by the movie.