Google seems to be testing showing the number of reviews a reviewer has under his or her belt in the reviews snippet for local search results.
Here is a screen show showing how the first person listed leaving a review only left one review in their Google review lifetime but the second one, Jennifer, has left 22 reviews in Google Local listings. This screen shot was posted by Joy Hawkins on Twitter.
Clearly, Google is trying to convey that not all reviews are equal and that possibly, the review from Jennifer might be more credible than the one from Amy. Although, that is not 100% true and thus, Google just shows you the data and lets you do what you want with it.
I think this is a nice touch.
Forum discussion at Twitter.
Source: Search Engine Roundtable