Apple’s WWDC commences later today at 1PM EST, and it’s expected that iOS 7 is going to be shown off with an all-new flat design.As our sister site ExtremeTech reported a couple of months ago, iOS 7 is expected to dispense with the Apple standard skeuomorphism, which is a technique that makes a design look like a real-life material. For instance, Apple’s address book mimics a real-life address book, rather than simply looking like some kind of sleek, flat interface, while certain iOS and OS X backgrounds look like linen instead of plain black wallpaper. The iOS 7 interface is also expected to be dragged into modern times with a more flat design aesthetic, with icons looking less like tangible buttons and more like something that would appear on a flat screen. Furthermore, the iOS 7’s apps will reportedly have a more unified look, sharing in flat white, grey, black, and silver textures.If you’re having trouble picturing what “flat” may look like, imagine the current iOS navigation buttons and bars without their shadows. 9to5Mac claims to have seen the new iOS 7, and made a mockup of the new design, seen below.Along with a seemingly major redesign of iOS aesthetics, Apple is also rumored to be showing off a revamped Camera app that will introduce Instagram-like photo filters. We hope this will lead to double filters when you upload photos of classy brunch to Instagram. As for when iOS will be released to consumers, the current word on the information superhighway is it’ll drop around September — right around the timeframe new iPhone’s tend to release.Along with iOS 7, Apple is also expected to unveil OS X 10.9, though rumors suggest that the desktop operating system will not follow iOS 7 into the flat future, and will simply co-opt a few more design choices from iOS. As we all know, Apple’s desktop and mobile operating systems have been on a crash course for quite a while now, and 10.9 seems like another incremental step in that direction. We might see Apple introduce an iOS-style app-switching bar — when you double-click an iDevice’s Home button — but rather than attempt to replace the trusty Command+Tab, the feature may be to pause background processes in order to conserve power.Apple may also show off new MacBook Airs and MacBook Pros, with both expected to get a Haswell upgrade.Perhaps the biggest bomb (aside from a flat iOS) that might drop while we’re tucked away in our survival shelters is the introduction of a Pandora-like radio service. It’s an Apple product, so it’d be safe to expect a simple name reflective of the service, such as “Radio.” Whereas Pandora knows what to play based on what you previously listened to, Apple’s service might also bolster your playlist based on iTunes purchases you’ve previously made — similar to how Steam will suggest every single MOBA in its catalog if you happened to try Dota 2 once.