The Swift 3.0 preview can be downloaded from the official Swift website. There are versions of Swift 3.0 available for Xcode 7.2, Ubuntu 14.01, and Ubuntu 15.10.
Swift 3.0 is not source compatible with Swift 2.2 as it introduces source-breaking changes, but going forward, the goal is to make Swift 3.0 source compatible with future Swift language updates. To meet that goal, Swift 3.0 "focuses on getting the basics right for the long term."
Apple will likely show off Swift 3.0 at its upcoming Worldwide Developers Conference, debuting it alongside iOS 10, OS X 10.12, and new versions of tvOS and watchOS.
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