After the disappointing performance of Prince Caspian, Disney backed out of the Narnia movies leaving Walden without a distribution partner. Fox just picked it up, meaning that the Voyage of the Dawn Treader will still get made. This is a good thing as Dawn Treader is most people's favorite book. They're also going to be putting the movie in theaters around Christmas instead of during the summer movie season.
I actually liked the Prince Caspain film a fair bit. I like the book, but it a kind of a narrative muddle. A large part of it takes place in flashback and the Pevensie kids only appear at the end of Caspian's story to set things right. They tried to streamline this in the movie by starting the movie with Caspian's flight and then bringing the British kids into the story earlier. It sort of works. They still don't get Peter's character anywhere near right, but the other three kids are better. I really liked Edmund and the mice.
I think the next movie will be very interesting. They won't have to play with the story so much in order to create huge visuals, those are already in the book. We'll see how the work the book's episodic nature into the movie though.