My, what pretty eyes you have there. All the better to see how Deus Ex: Mankind Divided will use eye tracking technology to "enhance" the gameplay experience for some. In a collaboration between Tobii and Eidos Montreal, Mankind Divided will support "multiple eye-tracking features" such as "greater game immersion, a cleaner UI, and enhanced navigation." This is made possible through the use of a Tobii EyeX device and a copy of Deus Ex: Mankind Divided.
Aim at GazeExtended ViewIcarus Dash at gazeInteract at gazeClean UICover at Gaze

That seems fairly neat, I think? The EyeX is a $139 (USD) device though, which may be a bit too rich for some people's tastes.