With the release of iOS 4.3 Beta 2, Apple silently notifies the developer that new multi-gestures feature will not be available to the public when iOS 4.3 is released.
This beta release contains a preview of new multitasking gestures for iPad. You can use four or five fingers to pinch to the Home Screen, swipe up to reveal the multitasking bar, and swipe left or right between apps. This feature will not be enabled in iOS 4.3 for customers, but we are providing this preview to gather input on how these gestures work with your apps.
Apple deliver this news to developers via Read Me file included with iOS 4.3 Beta 2 release, Now Apple is saying that these gestures are simply for developers to test them with their own apps.
Check This Video For Seeing How The New Gestures Work: