It typically isn't. They usually don't say it in advance - Same with all the times Photos has upgraded the library.
... I'm going to try and get around as much of that as I can...
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So on the left there you can see there are two lists.
On the right is what the suggestion thing works. It uses natural language to read the reminder and suggest what the metadata is vs the actual reminder.
Right clicking a group gets you this context-menu
View attachment 842503
Inviting people to a Reminders list:
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I sadly can't show you groups without updating the database:
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But here's the Preferences menu
View attachment 842506
It gives you a clean overview of reminders today and for future.
Either I couldn't find any of the other new features, or it requires the database update - probably the latter.
Sorry.