I hope they use the where-is-the-player-looking tech to incorporate an advanced depth of field. Like, in CoD and many other shooters, the image is focused at the object/place where you are aiming with your gun. But with this, it could track where are you looking on screen and then adjust the depth-of-field effect so that the image is focused on where you are looking. Of course, it would have problems with transparent windows, but it would still be a lot better than dof effects which orientate around scripts and where you are pointing the gun.
And the other biometric stuff would be great for timing some action scenes, where there's something scary supposed to happen.
And a linux port would be AWESOME TOO!!!!