Neowin just published about a Swedish company (Tobii) which has invented a tool to make Windows 8 much cooler (though regrettably not any prettier).
If you watch the video, you’ll see that this tool is used in conjunction with a mouse or touchpad. Also, it could probably be used with a Wacom type device.
This device will be demo’d at CES 2012 at the MS booth.
So, to launch an app, just look (or gaze) at it and touch the pad… poof!
Source:
http://www.neowin.net/news/windows-8-demoed-with-new-gaze-eye-tracking-tool
http://allthingsd.com/20120105/at-ces-control-your-computer-screen-with-your-gaze/