AR is Google Glass or 3D/Vita/Smartphone demos, only MS wants to provide real world object tracking and placing of computer generated objects in our view [in addition to static Bing-powered HUD stats].
Yup, VR and AR are the opposite of each other. AR is bringing digital world into our world while VR is taking you from our world into a digital world that being said, Sony has been at these things for a long time.
1. Sony Prototype from 2008