It comes from a newspaper reporter in Colorado Springs. I’ll e-mail some folks and try to figure out if it is official or not. Here’s what the article says:
Regarding [The Chronicles of Narnia: The Voyage of the Dawn Treader], despite rumors that the franchise was so toxic that Walt Disney Pictures happily passed the film to 20th Century Fox — and would be discontinued thereafter — a sequel has been greenlit. That’s right, ladies and gentlemen: Get your camping tents ready for the release of The Magician’s Nephew.
Thanks to Narnia Fans Spy Louloudi the Centaur