Walden Media, having already made movie adaptions of The Lion, the Witch and the Wardrobe, Prince Caspian and The Voyage of the Dawn Treader, also retains the option to make The Chronicles of Narnia: The Horse and His Boy in the future.
According to the booklet notes the last song of the set, "The Nowhere Man", is taken from the 1954 novel by C.S. Lewis "The Horse and His Boy".
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He is a principal character in three of the seven books (The Lion, the Witch and the Wardrobe, Prince Caspian, and The Voyage of the Dawn Treader), and a lesser character in two others (The Horse and His Boy and The Last Battle).
Lucy is a principal character in three of the seven books (The Lion, the Witch and the Wardrobe, Prince Caspian, and The Voyage of the Dawn Treader), and a minor character in two others (The Horse and His Boy and The Last Battle).
Peter appears in four of the seven books; as a child and a principal character in The Lion, the Witch and the Wardrobe and Prince Caspian, and as an adult in The Horse and His Boy and The Last Battle.
For example, in The Horse and His Boy, Aravis says, "Now this Ahoshta is of base birth, though in these later years he has won the favor of the Tisroc (may he live for ever) by flattery and evil counsels..."
In The Horse and his Boy, (the events of which all occur during the reign of the four Pevensie children in Narnia, an era which begins and ends in the last chapter of The Lion, the Witch and the Wardrobe), Hwin and Aravis fall into company with the talking stallion, Bree, to whom Hwin is distantly related, and the boy Shasta.