My main concern is how precise you could get with this system. If it takes 30 seconds to position the cursor where you want it, it's no good. Obviously we haven't seen how well it does at this, but I'm not instantly assuming that just because it's a new idea, that it's practical. I reserve the right to make an opinion one way or another if a demonstration model is ever shown.
Thats the reason why 90% (or maybe even more) of their patents never show up in a real product. They have a cool idea, they play with it, if lucky they make a prototype, they make user studies, they find out it stinks and the world will never see it, except for the descriptions and pictures in those patent applications. That is part of why apple products are expensive, they spend a lot on research and development and trying new ideas that they have they have to trash after a while, every once in a while great things will come out of it. I don't think all those 'found' patent applications will give much of an idea of upcoming products, they shed rather some light on what apple is toying with and in which direction they do research.