Valve, please, bring back Dota VR Hub. There are not many of us, but it would be a good touch, especially for watching DPC matches. Anyway it was only optional to download,
Dota 2 releases full VR spectator suite—just in time for the International | Ars Technica
DOTA 2 VR HUB OMG Full 3D Showcase HTC Vive - YouTube
Spectating Dota 2 in VR is amazing, watch it in action - Polygon