An open hardware definition has been mulling around in a few emails ever since the Opening Hardware Workshop, put on by Ayah Bdeir. Tonight, a draft of the definition was released as well as an announcement for an Open Hardware Summit to discuss everything about Open Hardware.
The Open Hardware Summit is currently looking for speakers and sponsors. And there are lots more ways to get involved of course. You can also give your feedback on v0.3 of the Open Source Hardware Definition here: http://freedomdefined.org/OSHW