Apple Tablet to have multitouch tactile screen?

Apple has filed another patent for a screen capable of dynamically representing virtual buttons as physical buttons. With resent reports of Steve Jobs not only being happy with the much rumored Apple Tablet, but that we’d be surprised to find out how we interact with it, this doesn’t seem so far fetched. The problem with multitouch screens, like those of the iPhone, is that the user can only perceive the buttons displayed on the screen as images.