It may have taken a while, but with all these individuals and organizations cooperating in an open space, we may finally advance yet again into another new era of innovation for the web.
I am really excited about this, much like others in these comments.
We have been beating around the bush to have a true assembly/development layer in the browser for a long time: Java applets, Flash, Silverlight, you name it - but no true standard that was open like Javascript is open. This component has the possibility of being the neutral ground that everyone can build on top of.
To the creators (Brendan Eich et. al) & supporters, well done and best of luck in this endeavor. It's already started on the right foot (asm.js was what lead the way to this I think) - let's hope they can keep it cooperative and open as much as possible for the benefit of everyone!