One reason why I bet this won't ever happen is because it would create an inconsistency with how we use the iPhone. You can't do a five finger pinch easily on t

One reason why I bet this won't ever happen is because it would create an inconsistency with how we use the iPhone. You can't do a five finger pinch easily on the iPhone, so you would then have two different ways of 'going home'. This is one too many for apple. Remeber how they changed the rotate lock to a mute switch even though it didn't make that much sense to do so? THey did it /just/ to create consistency with the iPhone. There will be better iPad-centric ways of navigating iDevices, but a pure gesture based one is unlikely.