Would be amazing if Apple did something like OmniSharp (or OmniSwift) so great Swift experience would be easier in Atom, Emacs, Sublime ... even VS Code.
Looks like Apple provides something called "SourceKit" which is kind of like Clang's LibTooling, and "SourceKitten" is an open source wrapper providing something comparable to OmniSharp.
It's open source now... seems like a reasonable project for the community to pick up. (Not to say Apple shouldn't do it, but I don't see them doing it with Xcode being their default IDE)
If Federighi wants Swift to be pervasive (scripting, mobile, cloud, desktop) it would make sense to integrate with tools commonly used with operating systems deployed in the datacenter / cloud.
Just give me proper Vim support in XCode and I'm happy. For now.