You should really check it out, it's a sexy language. If you know java you'll feel right at home. I've been using it for almost five years and really love it. To me, the syntactic sugar they throw in for common little things are what really make it so nice. It's not overly verbose, enhancements on types can be amazingly powerful if you have no control over over an API, and the ability to use and pass blocks (similar to closures) are something that I hate being without when I am forced to go play in java-land.
https://github.com/jpcamara/Goson
And there is a web framework in progress: http://ronin-web.org/
But, yeah, it's mostly Guidewire.Getting a new language adopted is hard.
Could you digress?
Gosu is not pure nor particularly minimal: it's rooted in the historical experience of Java software development, for better and for worse. As such, it is more of an Aristotelean language: practical, derived from experience and not particularly concerned with unification.
I enjoy both languages, but I'm an Aristotle guy.