Swift source code will be released under an OSI-approved permissive license. Contributions from the community will be accepted — and encouraged. At launch we intend to contribute ports for OS X, iOS, and Linux. Source code will include the Swift compiler and standard library. We think it would be amazing for Swift to be on all your favorite platforms.
I long dreamed of using Objective C to build server apps. The compiler support has been there for years (GCC, later Clang), but there's no standard library. All the stuff you would want from Foundation is missing; strings, sockets, file I/O, encoding support, threads, etc., it turns out you'd have to reimplement a lot from scratch. There's GNUstep, but last I looked it, it was stagnant, and also very much geared towards GUI apps. Swift on the backend would be even better, I think. Between all the languages that have evolved lately (including Go and Rust), Swift has struck me as the one that feels the most like my ideal language.
我与 HN 上这位兄台的观点一致