Everyone seems to have their own list of things they want to see at WWDC, so I figured I should throw mine down on virtual paper too. I'll keep it short for you and mostly just include things that aren't on everyone else's lists.
With Xcode 9, it’s possible to mix and match Swift 3 and 4 libraries together. In the build settings for the project you set the version of Swift to use by configuring the
SWIFT_VERSION setting. You’re able to override the project setting at the target level, thereby