Microsoft have released an updated Dynamics 365 License guide.
Microsoft Business Applications MVP Erik Hougaard posted a great video summarising the changes related to Business Central - I read the Business Central License Guide, so you don't have to! - check it out on his YouTube channel. He regularly has great content, usually always as a video & usual live coding something fun!
I recently came across this handy web tool that will compare PDF files. So here is a side-by-side document comparison of the March and June license guides - https://draftable.com/compare/qrYAKYuokbfp
I was pleased to see the extra detail around the additional environments which confirms for every additional production environment this comes along with entitlement for 3 additional sandboxes, however only 4gb of additional database capacity space seems a bit low, fingers crossed Microsoft can up that in the future!