Gizmodo reports that Dean Kamen's DEKA arm has been approved by the FDA for sale to the public. There's much older video available that gives an idea of what installing this arm entails.
This video from the Verge tells a lot more.
This mind-controlled arm is the future of prosthetics — it's 90 Seconds with @samsheffer http://t.co/TqszXgAC5m
— The Verge (@verge) May 12, 2014