A lot of money is being poured into professional VR and AR applications right now. It does not happen very publicly. I am aware of a few in-house efforts of big manufacturing companies with rather big team sizes (dozens of developers at least). They are mostly centered around stuff where 3D visualization is beneficial and head tracking allows for that extra bit of interaction and exploration. Think "classic" AR ideas such as information overlays (disassembly instructions for mechanics, etc.). Except that this time around they can make the tracking so good that the overlays are really "there".