I first saw them demo this at the October 2012 HTML5 Developer's Conference. We attended their last two SF "meetups" in December 2013 where they promised they

I first saw them demo this at the October 2012 HTML5 Developer's Conference. We attended their last two SF "meetups" in December 2013 where they promised they would release the code right then (or the day after). Still no release, and no further mailings. This is effectively vaporware in my view, and they can't indefinitely dangle this carrot in front of developers before we get fed up.