A few of the motivations:
* A lisp with an amazing startup time
* A lisp that can tap into a big and vivid ecosystem, like Clojure is tapping into Java's and its own
* Cross compilation and self-contained binary (I've personally tried doing this with various lisps, and none of them really support it)
* Go as a platform is improving version by version and is very performant already
Another way to think of it - if only Clojure compiled to binary directly, then this would be pointless. Because chances of that happening are virtually zero, is why this project made my day.
Go is the assembly language of cloud infrastructure, just as Javascript is becoming yet another "assembly" language. I believe Go is perfect for this, because it is also simple (as opposed to ES6, for example).