There’s an updated (June 2021) Power Platform Licensing Guide.
There are just two minor updates, the first being that the availability of the Power Apps Portals login Tier 3 Add-on is no longer just restricted to CSP, and secondly, Process Advisor is added.
Process Advisor helps organisations decide which parts of their processes it would be best to automate, and it’s licensed via a Power Automate per User licence – you can find out more about Process Advisor here: https://bit.ly/3g1GotB, and the updated Power Platform Licensing Guide here: https://bit.ly/2Rv0KSx.