It seems that the new layout first reported on October 23rd is now rolling out world wide. As noted at the time
The big difference is that the page now can be displayed in either a single, two or three column layouts depending on browser window width as opposed to the current fixed two column display. Reviews will now follow the same columnar structure as the rest of the page and will not be limited to a current one column display. While this view is not yet visible in mobile, one assumes that if the view were to become universal it would likely push to mobile as well.
The page adds three iconic based calls to action near the top; review, directions & photos. The review summary has been moved up the page and photos have been moved down the page. Geo information including street address, category, hours, description and map are now consolidated into a single card near the top titled “Contact Information. “Similar Places” from around the web no longer show and “reviews from around the web” have been moved up the page to be nearer the top.
However it also appears that Google, in making the change, has lost, at least temporarily, a number of reviews. The forums as well as some of my clients noted a severe decline in review counts or wildly inaccurate review counts. Barbara Oliver & Co Jewelry in Buffalo dropped from 65 to 38 reviews. Her local competitor lost roughly 30 as well. I assume that most of these lost reviews will return once the upgrade settles in.
Google Rolling out New + Page Layout - Reviews Lost in the Process by Mike Blumenthal