The new Mixed Reality feature is now available in Power Apps Experimental mode! It isn't production ready, however, I highly recommend you start playing with it. This video walks you through the following:
- Turning on the experimental feature
- Finding 3D models using the Windows 10 3D Builder application
- Using OneDrive, SharePoint Online and GitHub as a back-end storage
- How to use the MR 3D Control in a Canvas App
