Apple have started a new blog to help developers interested in Swift, Swift is a new programming language for Cocoa and Cocoa Touch.
Get started with Swift by downloading Xcode 6 beta, now available to all Registered Apple Developers for free. The Swift Resources tab has a ton of great links to videos, documentation, books, and sample code to help you become one of the world's first Swift experts. There's never been a better time to get coding!
The first blog entry deals with the issue of compatibility, and how to ensure your app will continue to function as the language evolves.