Part of me is happy. Apple pushed MacRuby before Lion and effectively killed it internally going forward after the ARC announcement. MacRuby relies on the GC capability of Objective-C which is incompatible with their new ARC baby. Just a few days ago I wanted to take a backend framework we wrote and build a command line tool to call some of it's methods in MacRuby (lots of command line parsing and Ruby has good facilities for that) but forgot we converted that framework to ARC. No dice.

This looks promising but at the same time I really wish the backend compiler was open sourced and worked on Mac and not just iOS.