Google+ is going through changes. A drastic redesign hit the browser version of the social network a while back, and the developers continue to push out tweaks.
Googler Luke Wroblewski has provided a look at several changes making their way into the website. When you're scrolling through your feed, a post indicator will appear at the top of your screen whenever new content has appeared (pictured above). Large profile images will now appear in a gallery. The site should provide a better, more visually integrated experience when searching for people. You can also see who you've muted from the activity Log and un-mute them if you've forgotten how they annoyed you in the first place.
These changes started rolling out on Friday, so they may be available now for you to experience right away.