Что нового в Kotlin 2.1.0-Beta2

- IDE support
- Support for requiring opt-in to extend APIs
- Preview of the new language features
- New Gradle DSL for compiler options in multiplatform projects is stable
- Improved overload resolution for functions with generic types
- Improved K2 kapt implementation
- Update LLVM version to 16.0.0 for Kotlin/Native
- Kotlin/Wasm
- Gradle improvements
- Compose compiler updates

https://kotlinlang.org/docs/whatsnew-eap.html