It looks like Yelp may have gotten its wish - for Google not to use its data for Place Pages. It is still unclear to me how less search engine visibility is a good thing , but, Google Place Pages appear to have eliminated Yelp. This was first spotted by TechCrunch, and is as of yet unconfirmed, but doing various searches (including one I did for a previous article on the subject, which used to return Yelp content), Yelp content appears to be gone from Place Pages.