Varjo XR-4 headsets will require a $2500/year subscription for certain advanced mixed reality features.Varjo is a Finland-based startup that sells ultra-high-end tethered PC VR headsets for enterprise and government users.The subscription will come with the launch of the revamped Varjo Base software on March 25.Varjo Base Pro will support advanced mixed reality features and will be available for $2500/year per headset.