This release includes features like implicit self for weak self captures, conditional compilation for attributes, new type StaticBigInt in standard library, and more.
Swift 5.7, included in Xcode 14 Beta, introduces a whole spectrum of changes, from smaller syntax improvements to larger generics and concurrency updates.
Swift 5.6 includes a number of enhancements to the type system, improved interaction with pointers, and adds the ability to run new plugin commands using the package manager.