A/B testing is finally available on the iOS App Store! You will discover the difference between Custom Product Pages and Product Page Optimization.
About Product Page Optimization
Compare different app icons, screenshots, and app previews on your App Store product page to find out which resonates with people most. You can test up to three alternate product page versions against the original, view the results in App Analytics, and set the best performing version to display to everyone on the App Store.
Learn more: https://developer.apple.com/app-store/product-page-optimization/