Multicore OCaml is in the works and is looking amazing, but is indeed a ways away. They're taking their time and doing it properly so things are fast and safe.
The thing is, until it's shipped, it's still vaporware for most people, especially if they want to use it in a commercial setting.
KDE 4 was released in 2008 and it was supposed to be ported to Windows. We're in 2017 and KDE 5 is still far from being considered stable on Windows. And I'm sure you can also think of many examples of programs promised and never delivered or underdelivered.
It was ported to Windows. I cannot check the remarks about stability because I use Linux, but it sounds plausible. There's only a handful (maybe 2 or 3) developers working on Windows support in their spare-time AFAIK. I would guess that KDE had anticipated more Windows developers joining the project as it progressed towards maturity.
That's always the problem with open-source projects: It's very hard to do planning and forecasting with a bunch of volunteers. Even if they commit to a roadmap, there will always be someone who has to step down because of private issues (new job, new child, etc.). Go is in a much better position since Google has headcount assigned to it (again, AFAIK).
It isn't a great concurrency story, but the shortcomings are also overstated. OCaml does message-passing concurrency just fine and allows for shared memory for arrays and matrices of scalars, which is good enough for most scenarios.
(Technically, there's also Ocamlnet's multicore library, but that's too low-level for most people.)
F# is pretty good there, especially if one uses a library like Hopac. However I think it's still not on the level of Go, since concurrent operations are represented through monadic types (like Job<T>), and so everything has one level of indirection. F# workflow builders ("do notation") makes that somewhat more bearable, but I still think it's harder to work with than just using normal function calls on normal lightweight threads, like available in Go.
it's a bummer that the windows story for ocaml is so sketchy. i'd like to use it for work (various utilities and whatnot) but the ecosystem seems to make a lot of assumptions about the system it runs on. (for me there's still haskell and rust at least.)
