You thought Bionic eLegs were exciting, for people with mobility problems, how about a whole exoskeleton to let paraplegics walk?
Phew--small potatoes, what if it was controlled entirely by your mind? Such a thing already exists! We know that specific areas of our brain activates when we perform specific actions, and now they are figuring out ways to use that neuro-electrical activity as input to control machinery. Woot!
If that isn't sciencefictiony enough for you, consider: the brain activity occurs BEFORE the corresponding motor actions. So devices can read what you are about to do while you are still only thinking about doing it, before you actually do anything at all. The future is unimaginable, and scary-hopeful.
Think what if we develop this stuff like we developed computers, or phones, or cars.