I just got an Insiders e-mail regarding the webcast. It is strange I still get those while being denied access to any Insider sites. Probably that I don't have an active system involved. The update the public got on Thursday (KB4535996) did say it should improve the visual for WMR headsets. I did notice today my VR headset seemed to have a different user interface..
There was a comment about no new builds available this week due to a build block, which they were working on..