Google says over 1 million applications are using app bundles. This includes the majority of the top 1,000 apps and games on the Play Store, including Twitter, Netflix, Gameloft titles, Adobe, and Duolingo.

In addition to the APK being replaced for new apps, developers will have to replace large expansion files (OBBs) with Play Asset or Feature Delivery. Similarly, Instant-enabled Android App Bundles replace the Instant app ZIP for distributing new and updating “instant experiences.”

Existing applications are exempted, along with private apps for managed enterprise users. Looking ahead, Play App Signing — a key part of the AAB process — will take advantage of APK Signature Scheme v4 to “access upcoming performance features available on newer devices.”

https://9to5google.com/2021/06/29/android-app-bundle-new-default/

I am wondering if aab can be shared offline with peer devices.