Once I got it in my hands, I linked it to my associated Gmail account and G+ account. Then, I got started. One of the first things I noticed was that I was presented with many open source software tools to work with. This was exciting. And, I soon learned that it was thanks to these open source resources that Glass development can be done quickly and successfully.
The software stack for the Glass builds upon the Android platform, and hence, on top of the Linux Kernel. It was indeed customized for Glass and is available as google-glass-kernel-source.