Apple is also limiting the amount of times developers can ask customers for reviews. Developers will only be able to bring up the review dialog three times a year. If a customer has rated the app, they will not be prompted again. If a customer has dismissed the review prompt three times, they will not be asked to review the app for another year.
In addition, App Store reviews can be marked as ‘Helpful’ using 3D Touch from an iPhone, which is a first.
These limits strike me as fair and should help prevent the new app reviews API from being abused.