I took that text from "5-3-release-process" I'm not talking about Swift compiling on Windows, I'm talking about the GUI situation, but I'll install it and hopefully be pleasantly surprised with a full featured GUI SDK. But don't get me wrong, a supported compiler and std lib for Windows from Apple is a fantastic start.
This is the actual port which has the CI and Installer for Swift on Windows: [0]
[0] https://github.com/compnerd/swift-build/releases