According to Variety The Chronicles of Narnia: The Silver Chair has finally found a director, Captain America: The First Avenger and Jumanji helmer Joe Johnston.
Looking at Joe Johnston’s credits he could be a good fit for this, although he has had his ups the downs (looking at you Jurassic Park III). The new movie, which is meant as a revival to the series, will be called Narnia: The Silver Chair and the screenplay is being written by David Magee (who also penned The Life of Pi and is writing Mary Poppins Returns for Disney) based on the novel ‘The Silver Chair’ by C.S. Lewis. While this was indeed Lewis’ 4th published novel in the Chronicles of Narnia series (which totals 7 books), following ‘The Voyage of the Dawn Treader’, the film will act as something of a reboot among the Narnia movies. So definitely don’t expect Will Poulter to reprise the role of Eustace Scrubb (among many other reasons because the actor is now 24).
Narnia: The Silver Chair should still technically fit within that same universe, you just won’t see any of the same familiar faces returning. Good thing Eustace and a much older Caspian (which could be played by anyone really) are about the only major returning characters from The Voyage of the Dawn Treader. I guess Liam Neeson could still maybe voice Aslan, that is if he is up for one more. Narnia: The Silver Chair has no official release date yet.