Google has just published a new "Images and Kernel Downloads" section on its Google Glass developer website, which means that developers can now root Glass and flash it back to factory specifications. The new section also gives access to the latest factory image (XE5) and the bootloader. There's also a source code for the kernal which can be downloaded as well.
There's nothing much to ogle here, except for the downloadables and Google's warning: "Rooting, unlocking, or flashing your Glass voids your warranty and can leave your device in an irrecoverable state. You will no longer receive OTA updates if you unlock or root your GLass. There is no guarantee that you will receive OTA updates even after flashing back to factory specifications. Proceed at your own risk."
Source: Android Police