[Shank]

The Swift Open Source community is quite vibrant. They're already building it on Linux + macOS. See: https://github.com/apple/swift

Edit: They also have a Platform Support page, where they discuss their goals/intentions on cross-platform: https://swift.org/about/#platform-support

[vvanders]

There's quite a few windows developers out there as well for which I don't think we'll see Swift any time soon. In contrast Rust has fantastic windows support.

[edit]

Yup, no mention of win32 on that page at all.