The big change here is that when you include third-party syndicated reviews that are not “directly produced by your site,” you should not mark up those reviews with schema. Only “directly produced by your site, not reviews from third-party sites or syndicated reviews” should be marked up, according to these guidelines. This may impact a large number of websites that have implemented local reviews markup. You should read all the new guidelines, but again, the biggest change and the one that probably will have the most impact right now is the third-party prohibition. Get the full story at Search Engine Land Read also " 3.1: Hotels and hospitality just got a lot more structured"