NAMM 2014 - we bumped into Keith McMillen himself at the KMI booth where he gave us the lowdown on his new Strong Arm Sustaun system for Fender spacing guitars (Tele/Strat). Its built into the saddle pieces and can provide various levels of sustain and bloom. Additionally it has a motion sensor built in sou you can realtime modify parameters of the guitar by moving the neck up and down as well as flipping presets with sharper movements.
Being a Keith McMillen invention, its got some really interesting angles on the whole polyphonic guitar sustain thing - Keith told us he's been working on it on and off for many years.
it requires a section to be take out of the guitar body to house the electronics and battery but no more than you see on other modified guitars.
No pricing or availability information available just yet.