Communities larger than 8k will be migrated. Please refer to this help center article for more details: https://support.google.com/a/answer/11930874

We will publish the content as part of the change management material in the coming weeks.

Many of these features are already implemented. We are continuously launching new capabilities and you can also find what's new here: https://support.google.com/a/table/7314896?visit_id=637988517687735877-1321573329&p=whatsnew&rd=1

We will make it available as part of the change management document that we will publish in the coming weeks.

Hi Kim, Google+ posts - For posts older than Jul 2020, you can download that data via takeout. Retention policy - Currents doesn't have any data retention policies today. But if you have data retention policies set for Chat and Spaces, then we will h...