iPad 2 and iPhone 5 = No more Home Button?

Redmond Pie recently posted an article called "Apple to Replace Home Button on iPad 2 and iPhone 5 with Multi-touch Gestures – Report" which is an interesting read.  It talks about some intel BGR received about the removal of the Home button from the iPad 2 and iPhone 5:

We have exclusively been told that the reason Apple just added multitouch gestures for the iPad in the latest iOS 4.3 beta is because the iPad will be losing the home button. Yes, we are told that Apple, at some point in time, will remove the home button from the iPad’s design. Instead of button taps, you will use new multitouch gestures to navigate to the home screen and also to launch the app switcher.

I'm curious which gesture will allow you to close an app...  Thoughts? ;)