I have played around with Go in the past 2 years. At first I enjoyed its simplicity, then I got bored by its simplicity. IMO, Go is not very well suited for scientific programming.
Rust is more interesting, and I see it as a good contender for C++ in the future.
Recently, I had to do more linear algebra and I really fell in love with Julia.
Incindently, I blogged about all this recently: Why did I choose the Go language?