This is what I think Apple are doing with Mac OS X Lion. Look at the 11-inch Macbook Air running OS X Lion for example. It is aDevice. Almost like an iOS device. Like an iPad Pro. An iPad with keyboard. OS X Lion makes a computer with a Touchpad a touch and gestured based device, and the incredible small and light MacBook Air is as mobile it can be.
Microsoft is on top of the world right now--well, at the top of the tech section of Google News, anyway--after it unveiled its Metro user interface design.