Google starts a program where potential explorers have 10 days to try Glass frames and see which frame they prefer. The frames are on real Glass devices, but the USB ports are destroyed so they cannot be charged, thus making it impossible to steal the devices and sell them for profit:
You told us you’re interested in purchasing Glass, but wanted to wait until we had frames for Glass. We have some good news for you. We recently introduced the Titanium Collection — four feather-light titanium frames that are designed to fit with your prescription and personal style. And even more good news — you’ve been selected to participate in a free home try-on pilot, to help you find the frame style and Glass color that fits you best before you purchase.