There’s an updated (February 2020) Power Apps Licensing Guide. There are changes for the renaming of Talent to Human Resources, and Retail to Commerce, and a correction made for the Power Apps per app default capacity where the File capacity should be 20 GB (not 2 GB), and the Log capacity should be 2 GB (not 200 MB). Find full change details, as usual, in the Change Log on page 25, and the guide itself here: http://bit.ly/PowAppsLGFeb2020.
The Dynamics team continue their update of their licensing guides before the licensing changes that are due in October 2019. It’s literally just a removal of any references to the Dynamics 365 plans that differentiates the October 2019 edition of the Dynamics 365 Business Edition Licensing Guide and you can find it here: http://bit.ly/MSLicensingGuides.