Two days ago, Google Glass received the XE16 update that bumped the device up to KitKat, introduced photo bundles, brought in sorted voice commands, and added a number of other features. This release was different for a few reasons, the most notable of which being the long wait (the last release was XE12 back in December).
Now the Glass team has released the update's system image to the Internet. The file is available for download from the usual location.
The zip file containing the goods weighs in at 432MB total. This data comes after four months of waiting, so there's plenty here for developer types to have fun with.
Source: Google Developers