Narnia after Prince Caspian?

Which book are they making a movie of next? Is it official yet? They skipped book three (The Horse and His Boy), and they never did book one (The Magician’s Nephew), so I’m not entirely sure what the order they are making these movies is. My guess would be book 5 (The Voyage of the Dawn Treader). Does anybody know the order that they’ll release all the movies? Thanks!