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One of the most intriguing developments announced at Apple's Worldwide Developer's Conference (WDCC) on June 2 was the introduction of Swift, a new programming language that works alongside Objective-C to make developing for iOS and OS X more streamlined.
According to Apple's official release language,
Swift builds on the best of C and Objective-C, without the constraints of C compatibility. Swift adopts safe programming patterns and adds modern features to make programming easier, more flexible, and more fun. Swift’s clean slate, backed by the mature and much-loved Cocoa and Cocoa Touch frameworks, is an opportunity to reimagine how software development works.
iOS 8 as a whole builds upon the drastic design and interactivity changes we saw in iOS 7, with a particular emphasis on access across an array of Apple devices. There are overhauls to photo management, iMessage and design as well as quality-of-life changes like a more intelligent keywording system for texting and the ability for quick replies from outside the messaging app.
Alongside Swift (which you can read more about in "The Swift Programming Language," available through Apple), flexibility in sandboxes, changes to the App store and Apple cloud will all work together to encourage developers to experiment with iOS.
You can read more about Swift here.