Late last year, Google unveiled a new version of Google+ for both the web and mobile. There were a couple of reasons for this. One was to make it more uniform across Google's products, in making it material design. But the other was to make the website much more lighter, making it quicker to load, specifically on slower internet connections. Since unveiling the updated interface, Google+ has made it available for everyone to try out, or they can stick with the older version of Google+. The new preview is actually still under development, with more features being added all the time, as well as things changing up.
In today's update to the web preview, there are two big features coming to the desktop. One is search within communities. This was and still is, available on the older version of Google+. Essentially what it allows you to do is search for posts within a specific community, instead of all of Google+. Makes things much easier when searching for a specific post.
The other feature coming to desktops today is the ability to re-order images within a Google+ post before posting it with drag and drop functionality. So if you are getting ready to post a bunch of pictures on Google+, you can drag and drop these images into the order that you'd like them to appear in when you post this update or post. Maybe not a big feature, but it is a feature that many people are going to love and have been asking for.
In addition to adding those two new features to this version of the web preview, the Google+ team notes that they have fixed around 220 bugs in the preview. As well as fixing up 3 accessibility issues. So the web preview, overall, should be running a bit better for those using the preview instead of the older version of Google+. This update is rolling out on the web right now, and everyone should have the update rather soon, if you don't have it already. And as always, if you notice bugs, it's important to report them to Google so that they can be addressed.