I'm no guitarist, but I think this thing is amazing!
https://www.youtube.com/watch?v=fxrsYJsQMs0
The video is from 2011, but I heard that ACPAD is close to release. It seems to be some kind of MIDI controller. In contrast to the thing in the video the release version should be a thin foil that's glued onto the instrument, and it provides pads, faders etc.
Here in this video @ 36:20 (in German, sorry) it's shown how the thing looks today. They also say that ACPAD will provide two loop players and WiFi!
https://youtu.be/JiERhCC1nO4?t=36m20s