One of the major trends at SXSW this year is wearable technology. There are over 60 conference sessions covering the topic alone, including smart hats, shirts, shoes and more. In the near future, your wardrobe will not only need to match in color, but also by Wi-Fi connections.
The topic of gesture mechanics (controlling computers by motion) was really big at SXSW a few years ago when the Xbox Kinect first launched. Combine this with components of wearable technology and you may have the next generation of user interfaces.