Hi John Tropea,
We also announced a new Yammer web part (more here). The aggreation of the various group feeds is not solved, and it would be easy to create a section of your hub sites home, or within a news article, or on a page within a communicaiton site (the tech is the same throughout). I could envision creating a three-column layout, and using the Yammer web part three time, each instance showcasing a different group feed - side by side in the context you set at the site or page/article level.
Microsoft Teams introduces a new element for sure, and we've first decided to tackle the push of SharePoint content into a Teams channel/discussion. Now that their API is ready, we'll begin to further plan future integration offerings between the two. Lots of great feedback flowing in, with early #likes on how SharePoint files, pages and news flow into the chat-based workspace.
Thanks,
Mark