Swift is the only one being actively pushed into developers by an OS vendor.

Apparently Genode OS has now integrated Rust, but they still aren't using it.

It would be nice if the Android team recognised the work being done by the Go team and integrated Go into its OS at very least on the NDK, but I don't see it happen. Specially after seeing their reaction about Java alternatives at this Google IO. The attitude "nothing but Java" is still the official one.

On Windows I would like to see .NET Native become more relevant and bring System C# goodies to mainstream Windows.