@HaroldL , the release page 'indicates' that everyone get all new improvements, except for Pro who get 1 additional feature and Expert that gets 2 more! Now I know that won't be the case, but the information isn't clear, especially for Pro and Atom users who I know won't get everything.
@Clint was wanting some clarification, which sadly the releases page does not really give.
Based on the maintenance costs of Atom, Pro and Expert, I would expect that Expert gets far more than the others with Atom getting a few enhancements. Pro somewhere in between. If not, then why is there such a massive difference in maintenance costs between the products? ... I digress. Still doesn't clearly address the OP's request for a breakdown per version.
What it needs is an icon next to each itemised feature/enhancement showing which version it's applicable to. Similar to the help topics.
I guess
@Max or one of the other nice folks in the Alibre team can clarify (and hopefully put that information on the release webpage too).