Vanessa from the Google Maps team posted a thread at the Google Places Help forums informing Google Place business holders they may receive emails from Google notifying them that their listings will be updated.

Vanessa explained these email notifications are to inform you prior to when Google makes the update. Here is what Vanessa said:

Here is a picture of an email I received on Friday:

So don’t be worried if you received this email, this is legit.

Forum discussion at Google Places Help.