Like many of Google's offering, Google+, or more simply, G+, has undergone a number of major changes in the last twelve months. Of course, the very biggest of those changes came back in November, when Google announced a complete overhaul to the way in which Google+ looks (and even functions to some degree). At first, the update rolled straight out to the web version, although corresponding updates have also since rolled out to the Android version too. All with a view of bringing a more cohesive look and feel to Google+ and regardless of what platform you are using.
Well, the initial rolling out was not really a proper roll out, but was more of the making available of a preview version. As such, instead of simply replacing the web version of Google+ completely with the new one, the redesign was an opt-in version which you had to manually activate to try out. A feature which is still in place today and allows for users to revert back to the 'Classic' look if they prefer. Not a bad idea while the team works out the various bugs and kinks.
Speaking of which, back in December, Google also announced the newly added ability to pin posts to your Google+ account. This was an extension of the already in use feature that is available to Google+ page moderators and meant that anyone could pin posts so they remain the main and first post on their Google+ page. Well, if you had yet to see that feature specifically going live for you, then you might be seeing it this week. A post sent out yesterday by a member of the Google+ team notes that a number of changes are now going live (from Jan 14th) for the preview version of G+. One of which is the ability to pin posts to profiles. In addition, the post also details that there are quite the number of bug fixes (37 to be exact), as well as an easier way to move your posts to a Collection - another one of the newer features that Google+ has introduced in recent times. And also, an easier 'invite to community' process.