What are the most essential news for developers?

At WWDC, Apple announced several essential updates for developers:

Liquid Glass Design: A new design material called Liquid Glass was introduced, allowing developers to create more expressive and fluid user interfaces across all Apple platforms. This design update is one of the most significant changes for developers this year.
Apple Intelligence: Apple introduced Apple Intelligence, a personal intelligence system that integrates powerful generative models into iOS, iPadOS, and macOS. This system enhances language and image generation capabilities while maintaining user privacy.
Xcode Enhancements: Xcode received updates to improve developer productivity. Notable features include a new dynamic linking architecture for Xcode Previews, which streamlines the workflow by using the same build artifacts for previews and builds. Additionally, predictive code completion in Xcode has been enhanced with larger context usage.
Swift and SwiftUI Improvements: Swift has been updated to make code writing safer and more efficient, and SwiftUI has gained new APIs to help developers build modern user interfaces. These updates further expand app performance and capabilities.
Foundation Models Framework: This framework allows developers to use Apple's models to get responses in plain text or as structured Swift Data, facilitating the integration of app content and capabilities throughout the system.
Platform-Specific Updates: There are new APIs and features for various platforms, including iOS, iPadOS, macOS, and visionOS, which enhance app performance and user experience.

For more detailed insights, you can explore the Platforms State of the Union (21:10) session, which covers many of these updates.