There’s an updated (June 2019) Dynamics 365 Licensing Guide. Perhaps the most interesting information is on page 2 where we get some details on upcoming releases (Customer Service Chat, Forms Pro, and Call Intelligence), a name change (AI for Sales becomes Sales Insight), and a new segment (DoD).
These changes are all expected in July or August. There are also amendments for default capacities throughout, the most important one being confirmation that Sales/Customer Service Professional licences do not count towards the 10 licence minimum for the Dynamics 365 Portal.
As usual, consult the Change Log for extra clarity and find the document itself here: http://bit.ly/MSLicensingGuides.