Dari Swift Blog:

Today at WWDC, we announced Swift 2.0. This new version has even better performance, a new error handling API, and first-class support for availability checking. An d platform APIs feel even more natural in Swift with enhancements to the Apple SDKs.

Open Source
In addition to new features, the big news is that Apple will be making Swift open source later this year.

Di luar dugaan, Apple membuat Swift menjadi open source. Good job!