The expectation the S4 will feature eye-tracking capability has been heightened by existing technology in the Galaxy S3 - the phone's Smart Stay function stops the screen from dimming when somebody is looking at it.

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It may not quite do that - but the live demo of the new translation service looked very clever, as did the standout eye-tracking feature which enables you to pause a video by simply looking away, then restart it by focusing on the screen again.

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Once a specific feature is selected via eye-tracking, thumb controls or gesture recognition can be used to select navigation, infotainment, audio, HVAC, and even smartphone connectivity functions.

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Version 2.0 and on will also begin to feature an advanced Natural User Interface (NUI) based on hand gestures, eye tracking, and EEG brainwave sensors.

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