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Honestly, I have not seen a different in FB since this change. Groups look a little different but that is about it.

Is it that no one has attempted to add me to any groups without me knowing?

Its a gradual rollout. You probably don't have it yet.

What should one look for to identify the availability of these "new" groups?

The new groups look different, have different features. It should be up for everyone now.

I have received notifications that I have received it from FB.