There’s an updated (December 2019) Power Platform Licensing Guide. The main update is for the newly available Microsoft Power Virtual Agents – see our blog for an overview of the product and how it’s licensed: http://bit.ly/2rKcow9.
Other updates include the introduction of a Power Apps per App plan student licence, and name changes for PowerApps and Flow to Power Apps and Power Automate. Find this guide here: http://bit.ly/PowAppsLGDec2019.