I think the monospace will worth the wait. But the current fonts already hit a sweet spot, UI development for mobile apps. They will look amazing on the retina screens of iOS devices.
That seems particularly ironic to me, given that a font like this where all the letters are made to be maximally distinguishable would be most useful as a monospace font.
Here's the download link: http://sourceforge.net/projects/sourcesans.adobe/files/Sourc...