Apple announces that Swift of iOS will be open source from this point on. WWDC 2015 is home to this announcement, the honor of announcing goes to Apple's senior vice president of Software Engineering Craig Federighi. This open source bit will be married to the release of iOS 9. This software will be released for developers in a public beta starting in July. This will be a free upgrade as all IOS upgrades are, and "all currently supported devices" will be included. Developers rejoice, change is afoot.