GameActivity as new default: release notes (#1753)

Co-authored-by: Carter Anderson <mcanders1@gmail.com>

release-content/0.15/release-notes/12095_Add_features_to_switch_NativeActivity_and_GameActivity_usa.md

@@ -1,4 +1,16 @@
 <!-- Add features to switch `NativeActivity` and `GameActivity` usage -->
 <!-- https://github.com/bevyengine/bevy/pull/12095 -->
+Bevy now uses `GameActivity` as the default `Activity` for Android projects, replacing
+`NativeActivity`. `NativeActivity` is still available, but has been placed behind a feature flag.
 
-<!-- TODO -->
+This change updates Bevy to a more modern Android stack, and includes an SDK minimum version bump to
+[PlayStore's current version
+requirement](https://developer.android.com/distribute/best-practices/develop/target-sdk). We've also
+switched to a [`cargo-ndk`](https://docs.rs/crate/cargo-ndk/3.5.4) based build, which gives us more control by default. Gradle projects for both `GameActivity` and
+`NativeActivity` are provided.
+
+`GameActivity` brings with it improvements to game interaction (`SurfaceView` rendering, improved
+touch and input handling), more frequent updates, and access to other parts of the
+[JetPack](https://developer.android.com/jetpack) ecosystem. It is better placed to integrate with
+Rust code without excessive JNI wrangling. You can read more about `GameActivity`
+[here](https://developer.android.com/games/agdk/game-activity).