Swift 3.0 & Xcode 8

What’s New in Swift 3?
https://www.raywenderlich.com/135655/whats-new-swift-3

Development major version Swift 3.0 :
https://github.com/apple/swift-evolution

Migration guide :
https://swift.org/migration-guide/
https://developer.apple.com/swift/

Xcode 8 is now available in beta version.
Like usual, Xcode 8 will come with an automatic migration tool to swift 3.0.
Xcode 8 integrate many important enhancement specially for Interface Builder (xib)

https://developer.apple.com/xcode/
https://developer.apple.com/library/prerelease/content/documentation/DeveloperTools/Conceptual/WhatsNewXcode/introduction.html