Also the capability of Google Glass is very broad because there are many things that can be done including AR(Augmented Reality), the augmented reality is still in development but it's getting there. The people at Layar are working on the augmented reality. This seems interesting because with the capabilities of Google glass is it possible to simulate something like an augmented reality.
Many people on the internet have shared a few of their experiences with unity and Google glass API development. I read a few and found it interesting, but a bit complex to understand. I'm slowly starting to understand a bit. It's good to have a background in android development. because its a good transition. But I look forward to create at least a simple application for the Google Glass.