Open source contributor Colin Howell fixed a source of exponential behavior with dictionary literals:
Faster Mix-and-Match Builds with Precompiled Bridging Headers
Unwrapping optionals 馃槅
Mailing list meta-discussion has been reopened: https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170123/030646.html
What's new in Swift 3.1
https://www.hackingwithswift.com/swift3-1
Might want to add this to the Weekly as well: https://twitter.com/jckarter/status/825012717580726272
SE-0148, Generic Subscripts has been accepted!
https://github.com/apple/swift-evolution/blob/master/proposals/0148-generic-subscripts.md
https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170123/031048.html