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Walden Media and Walt Disney Pictures released their film adaptation of The Lion, the Witch and the Wardrobe in December 2005, grossing $745 Million worldwide. Prince Caspian was released in May 2008 and grossed $420 Million worldwide. 20th Century Fox and Walden Media released The Voyage of the Dawn Treader in December 2010 and grossed $415m worldwide. Now, the Mark Gordon Company is developing The Silver Chair (no release date yet).
Another video update from Douglas Gresham. In this one, he talks about the need to make changes when adapting a book for film. UPDATE: Expect updates like this every few weeks.
The Chronicles of Narnia: The Silver Chair is in development!
No release date has been set at this time.