Chris Lattner writes on Looking back on Swift 3 and ahead to Swift 4. Key tl;dr points: Open source is great but you can’t make everyone happy. Swift 3 in Fall 2016. Swift 3.x will release in Spring 2017. Swift 4 in Fall 2017, not counting minor releases for bugs/compatibility (e.g. 3.0.1) Swift 4 must deliver its source stability promise, plus resilience, ABI, improving generics, strings, etc. S