dotdotdot said:
Apple would most likely use like a "TabletWheel," where there is a button you click and the wheel spinns, each time all you see is 3 applications, only 18 applications can go on it max, though.
They could employee a small multifunctional 'trackpad' of sorts along the bottom frame. This could be used as a biometric reader (for security/login and locking) and also could serve as a side-scrolling menu-bar/dock manipulator.
Think of it as a little .5"x2" miniature trackpad along the lower frame, perhaps upper, that as you drag your finger sideways it moves the highlightered selection on the menubar sideways. There would have to be some form of a selection action to switch between menubar and dock, but that could be easily accomplished. Add the tap-click feature and you now have a scrollable, selectable menubar and dock in a single little strip. Plus, as shown on the PB, it could easily be color-matched to the casing so it wouldn't impact visuals too much, just a little detent set in by a 1/16" or so.