Disney announced this last week that all seven of the Narian books are to be released as films.
I've never actually ready the books [shock] but really enjoyed the first film (which was not the first book I believe), apparently the second film is going to be the fourth book! Confused? So am I.
The stories are obviously based on Christian themes, but then there are Christian themes to be found in a lot of mainstream films like Star Wars, Harry Potter etc. But then I guess C S Lewis wrote them in on purpose.
Here's my source for the story: