You want to try saying "Ok Glass" and see what happens? It is possible thanks to DEV and Xenologer that developed some applications for it!
For this you just need to download the following applications:
Home: http://zhuowei.github.io/Xenologer/glasshome-modded.apk
Camera: http://zhuowei.github.io/Xenologer/glasscamera-modded.apk
Maps: http://zhuowei.github.io/Xenologer/glassmaps-modded.apk
Hangouts (only works with Android 4.2 devices) http://zhuowei.github.io/Xenologer/glasshangouts-modded.apk
The Home Glass works as a alternative launcher.
Even though, it is limited (just the camera and navigation), the application responds very well to the voice and we cannot but wonder why there are not more applications to trigger the device by voice ... Because it seems to works very well