One of the UUIDs used by Glass:
public static final UUID IDENTITY_UUID = UUID.fromString("f96647cf-7f25-4277-843d-f407b4192f8b");
All Glass applications (excluding GlassSystemUI) are built with a bog-standard Android SDK, hence the use of reflection to access hidden APIs and no odexing.
Glass applications use a few Library Projects, as evidenced by the multiple R.java files:
./com/google/glass/home/R.java ./com/google/glass/logging/R.java