It was presented at JSConf last year: http://blip.tv/jsconf/jsconf2011-dethe-elza-5942746
Waterbear isn't a language like Scratch, it's a toolkit to create a Scratch-like visual programming interface to any language you like. There is active development on wrappers for Javascript, Java robotics, and Arduino.
It was presented at JSConf last year: http://blip.tv/jsconf/jsconf2011-dethe-elza-5942746