Google has improved some features on Google+. Now you can control how much information you wanted to see from a circle by using a slider bar as the gauge. Notifications menu has also become more informative.
Here is a video on the Circle information.
And here is one that talks about Pages on Google+. Businesses can now have more controls over it.
And lastly, Google introduces new Photo Lightbox that can fill the screen and has more fluid tagging function.
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(source)