Just last week owning and borrowing parameters got accepted as well. https://github.com/apple/swift-evolution/blob/main/proposals...
It’s been the focus for a while especially after the concurrency work. It’s probably the final major feature before Swift 6
https://github.com/apple/swift-evolution/blob/main/proposals...
as well as a way to explicitly move types:
https://github.com/apple/swift-evolution/blob/main/proposals...
I haven’t read either in-depth, though!