While direct brain control of prosthetics is a very awesome research area just by itself, these guys are stepping it up even further by providing sensory information, such as grip strength, back to the user. "Ideally, this tactile or haptic feedback will ... make it easier for patients to get their prosthetic arms to do exactly what they want them to do."
I'm excited to see this research making big leaps... and very curious as to what will follow this project. Perhaps direct electrical stimulation of the sensory information back to the brain?!