Apple is currently internally testing “multitasking gestures” on the iPhone in the latest iOS 4.3 beta… so you’ll have to use four fingers to swipe and navigate throughout your iPhone. This feature will also be included in the next update to the iPad. A video has surfaced that shows this in action and already fully working on the iPhone. Looks sleek but swiping four fingers across the iPhone might be a bit much.
Source: 9to5mac
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