Swift 3.0 Release Process
From the Swift Blog:
Swift 3.0 is a major release that is not source-compatible with Swift 2.2. It contains fundamental changes to the language and Swift Standard Library. A comprehensive list of implemented changes for Swift 3.0 can be found on the Swift evolution site.
Swift 3.0 is expected to be released sometime in late 2016. In addition to its Swift.org release, Swift 3.0 will ship in a future version of Xcode.