Eye Tracking Upgrade Package for DK2

I didn't know this was available. I'm sure it's great for a lot of things but all I can think about is using it to slew the gun in a combat heli sim to wherever you look.

http://www.mynewsdesk.com/us/pressreleases/sfn14-smi-launches-eye-tracking-upgrade-package-for-the-oculus-rift-dk2-hmd-1084984

http://www.smivision.com/en/gaze-and-eye-tracking-systems/products/eye-tracking-hmd-upgrade.html