http://www.patentlyapple.com/patently-apple/2012/01/apple-is-paving-the-way-for-a-new-3d-gui-for-ios-devices.html

first paragraph:

On January 12, 2012, the US Patent & Trademark Office published a patent application from Apple that reveals an exciting new 3D GUI for iOS mobile devices. The new UI will work with proximity sensor arrays and will respond to hovering gestures. The Crazy Ones in Cupertino have been working on advanced 3D GUIs for some time now. We first learned of a major 3D GUI project back in 2009 that involved using head tracking technology. Then in early 2010 we learned of Apple's first project relating to a 3D GUI for iOS devices. Later that year Apple 3D multifunctional widgets and over time revealed advanced 3D and hovering based gesturing for CAD users on an iPad. With twenty times the GPU power coming to iOS devices over the next year, Apple appears to paving the way for a new 3D GUI for mobile devices in the not-too-distant future.