You're likely purposefully not stating this, but I'll ask anyway since it's been a couple years since the On the road to Swift 6 post was made.
Swift 6 probably still operates under the "it'll be done when it's ready" timeline, so I don't expect any sort of commitment. Is there a vague idea of when Swift 6 might be released? I mean the actual source compatibility break, features will still come in minor releases along the way.
Within a year? Years out still?