The movies will be similarly titled, beginning with The Chronicles of Narnia. Each will have a subtitle that matches the book, i.e.: The Lion, the Witch, and the Wardrobe, and so forth. Each will have the main title of "The Chronicles of Narnia" to avoid confusion about the movies in the series.
It is very unlikely that the release dates will be moved up, as the special effects work will take a very long time to complete. We don't mind waiting for them to make it as good as possible before release though. It should be worth waiting for.
At the San Diego Comic-Con in 2007, they announced that the films from Prince Caspian through The Last Battle will be released every May. They've got enough of a lead time on shooting that this is a definite possibility and a very good thing. Very exciting!
If you're looking for a play that you can have a class perform, or for a school production, such as a musical, check our or page of Stage Plays!
The Lion, the Witch and the Wardrobe: We have spent many hours putting together a transcript.
Prince Caspian, etc: No, the scripts are top secret and are not available online, but you can always read the books.
Order them online, or check them out from your local library.