Cool. I like the idea of having a QR code displayed on screen.

Maybe you can do something similar to replace boarding passes for airlines? Many airlines these days allow you to do a web checkin at home etc.

Anyway, this reminded me that a friend created an app for Google Glass to show nearby transit options (trains/trams/buses etc) and their departure times.

https://github.com/longzheng/PTVGlass

So glasses vs watches?

To be honest, lets pick an arbitrary future date (eg: 5, 10, etc years from now) what type wearable tech would we be wearing?