Samsung has recently posted an image on Twitter that seems to hint the introduction of a retinal scanner on the features list of the upcoming Galaxy Note 4 phablet.
http://www.notebookcheck.net/Samsung-Galaxy-Note-4-may-feature-retinal-scanner.121124.0.html
Maybe related?
http://www.stack.com/2014/07/15/oculus-headset-release-date/ (samsung making phone VR headset)
Don't know about retinal scanner, even eye tracking would be really cool 8)
Great find! Not quite related, but eye tracking would surely be something cool, especially since Amazon has done it already... ;)