I noticed on the Bontrager (part of Trek Bikes) website the other day that they have introduced wireless versions of their flagship headlights and taillights. The headlight is the Ion 700 RT and the taillight is the Flare RT. The transmitter which can mount on the handlebars is called Transmitr. It uses the Ant+ wireless protocol, and the Transmitr can apparently control up to four lights remotely. There's a video on Youtube about it, too.