Google Plus communities have received a preview update that will allow owners to see who all in their circles have joined the particular hub.
On clicking the preview update, a pop-up window will appear with posts for the community, number of posts & members the community has, and who all in the circle of the community owners have joined it. Moreover, a button to join is also present. For those who want to explore further, a "View community" link underneath is also present.
The preview for communities is similar to what you see on clicking on a profile or the page on Discover tab, in "People" menu.
At present, the new preview window will work only while clicking on a community from "Communities you might like" card that pops up in the Explore/What's Hot tab and stream as well.
Fresh Community Default Photo
If your community doesn't have a custom photo uploaded, it will now show a light blue instead of a dull default photo.Google Plus Communities Gets Dual Updates with a Preview & Fresh Default Photo!,