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iOS 7: No more skeuomorphism!
One of the key changes expected in the next-generation mobile platform is the removal of skeuomorphism — a design that emulates the real item. The Notes app looked like a notepad, the Contacts app looked like a leather-bound organizer, and the Game Center sported a felt-like interface.
Instead, all apps will likely look and perform the same. New user interface guidelines may also be introduced as part of iOS 7 to bring a more consistent approach to the platform's design.
OS X 10.9 to be announced after iOS 7
We also know that OS X 10.9 will also be announced during the conference, but iOS 7 will likely have to be announced first, so the company doesn't blow the lid on any additions to OS X.
Apple has in recent years increasingly 'iOS-ified' its desktop platform with mobile-related features, in a bid to expand the wider ecosystem of Apple products.
OS X 10.9: Increased 'iOS-ification' between mobile and desktop
Apple began to bridge the gap between OS X and iOS 7 with OS X 10.8 Mountain Lion as it introduced Launchpad and apps ported from the mobile platform.
OS X 10.9 is therefore expected to become even 'easier' than it already is, according to reports. Designed with new users in mind, OS X will likely include a deeper integration of iOS 7's features. We can expect greater cooperation across the Apple desktop and mobile software ecosystem.
Other reports suggested that more "power features" will arrive in the next-generation platform, such as "app pausing," which allows devices to conserve battery power by not constantly using processing power on apps that are not in use.