There’s an updated (February 2020) Dynamics 365 Mixed Reality Licensing Guide. There’s just a small change confirming the file formats that are supported when importing 3D models on page 6. Find this updated guide here: http://bit.ly/MixRealLGFeb2020.
There’s an updated (July 2019) Dynamics 365 Business Central Licensing Guide. The major change is the addition of a new Device Subscription Licence which allows any number of users to use Business Central via a licensed device. It’s important to note that the Device SL gives access to a subset of Business Central capabilities which are detailed on page 8.
Find this guide with hundreds of its Licensing Guide friends here: http://bit.ly/MSLicensingGuides.