Spotted today, Google appears to be testing integrating reviews from other sources more prominently in the Knowledge Graph Google Business listings.
Several hotel and resort searches uncovered a brand-new feature: showing reviews from portal booking sites like TripAdvisor alongside Google Business reviews. Other reviews from third-party sites were showing as well: several resorts had Expedia reviews showing next to Google and TripAdvisor reviews.
Google appears to be heading into deeper integrations with TripAdvisor and Booking.com over the past year. Recently, Google added the ability to see aggregated reviews from popular listing sites under the ‘Reviews’ tab. This appears to be a deeper showing the full text, rating and source of the review.
UPDATE: After publishing this post, two new tests were shown during additional searches. In the first, Google has a rating for ‘Couples’ while the second test included a drop-down menu to filter the reviews between Google Business, Expedia, Booking.com and Hotels.com.