Apple vice president of software engineering Craig Federighi demonstrates the new Yosemite operating system at the World Wide developers conference in San Francisco, California June 2, 2014. [Photo/Agencies]

Cook claimed the previous, iOS 7 has an overall satisfaction rating of 97% and that "nearly half of our customers in China have switched from an Android to an iPhone".

According to Apple, iOS 8 builds on the clean and slick design of iOS 7. The biggest new features include new interactive notifications, health tracking, as well as the same Continuity features found on the Mac.

Apple also upgraded the messages application to include features that are found on popular messaging apps such as Tencent's WeChat and Line Corps Line.

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Apple's long rumored foray into health and fitness came in the addition of Health Kit to iOS 8. Health Kit's application, Health, can keep track of various health and fitness statistics as well as integrate with third-party hardware that tracks fitness.

Another major feature of iOS 8 is Family Sharing which shares content between devices and keeps tracks of accounts. Family Sharing has a feature that alerts parents to children who are trying buy and app and allows them to complete or cancel the child's purchase.

The latter half of the WWDC keynote was focused purely on developers and technologies that enable developers.

Apple is also planning to release a big update to its software development kit. This new SDK will include application programing interface tools that help developers create applications that use Apple's hardware to the fullest extent.

On top of opening up Apple hardware to developers, Apple has now put forward a new software coding language called Swift. The new coding language is said to make content creation much easier, with the addition of real time monitoring.

OS X Yosemite and iOS will be free when released to the masses this fall. So far there is no word on any new Apple hardware.