My main highlights from Apple WWDC 2021 in relation to Mobile Apps and the App Store:
In-App Events are timely events within apps and games — such as game competitions, movie premieres, live-streamed experiences, and more.
Product page optimization. Optimize your product page by comparing different app icons, screenshots, and app previews to see which resonate most with customers.
Storekit 2 APIs let you easily determine product entitlements and eligibility for offers, quickly get the history of all in-app purchase transactions for your app, find out the latest status of a subscription with one simple check, and more. New StoreKit 2 APIs return the same information as new App Store server APIs
In-App Events: https://developer.apple.com/app-store/in-app-events/
StoreKit 2: https://developer.apple.com/storekit/
Product Page Optimization: https://developer.apple.com/app-store/product-page-updates/