One of my hopes is facial recognition, to help me remember who this person is who send to remember me so well. Maybe a couple notes on the person that I keep on the side as well...
I often totally fail to recognize people outside of the contexts and places where I usually see them. So a fix would be amazing.
A killer app would be something that you use 5-10x a day like maps, camera or email. I think it will be contextual based on what you are doing. At home it will be assistance (search, instructional) and entertainment based. At work it will replace monitors. In transit it would replace phone/dashboard GPS.
I often totally fail to recognize people outside of the contexts and places where I usually see them. So a fix would be amazing.