Retina display huh? Retina is just another marketing word. Apple's retina display was surpassed by consumer technology more than a year ago. GS4 has a 441ppi screen while the Iphone 5 "Retina" display is just 326ppi.

.... okay?

I'm not sure why you thought that I didn't understand that Retina is a marketing term, or why it's relevant to the point I was making.

Perhaps because he has provided something to consider... - Edge touch with a new suite of gestures and gesture recognizers? - Side touch without obscuring the UI? - Sideways image projection via total internal reflection?