Charts framework, brand new and fixed NavigationStack. Multi-window and menu bar extras for MacOS SwfitUI apps. New Layout protocol and many other things.
Here is a detailed summary of the "What's new in SwiftUI" session from WWDC2022.
How to bridge data between the legacy app and SwiftUI back and forth. How to embed SwiftUI into UICollectionView and UITableView with UIHostingConfiguration.
Here is the summary for the "Use SwiftUI With UIKit" session from WWDC22.