Some business owners are reporting getting emails from Google and are asking if this is legit in the Google Business Help forums.
The emails are legit and coming from Google and the subject line is, "Action Required: You have 3 weeks to save your Google Places Listing."
Jade Wang from Google explained that they are making "some changes to Google Places for Business and Google Maps." Because of these changes, Google is "asking business owners to review and confirm some of the information in their Google Places accounts."
If you did receive this email, don’t worry. Please log into Places for Business, take a look at your business information, update it if necessary, and click “Submit.” You’ll need to do this for all listings in your account by February 21, 2014, so they can stay on Google Maps. Otherwise, you’ll need to add your business information and undergo PIN verification using Google Places again.
Forum discussion at Google Business Help.