Microsoft has applied for the following patent “Capacitive Sensors For Determining Eye Gaze Direction”.
The device does not include any eye tracking sensors but relies on the position and orientation of your head to “detect” what you are looking at. The technology is very fast allowing the sensor to track even rapid eye movements.
This latest technology would make gaze tracking on a headset much simpler, cheaper and unobtrusive which are all positive attributes.
Source: http://buff.ly/2hlMUez