Is Snowden still focused on PRISM alone? The blueprint to that is already out, it's called FISA and FISA Amendments perhaps sprinkled with a bit of Ruby on Rails and web services magic.
I just assumed he was talking about the technical, not legal, blueprint. I highly doubt a full stack web framework would be the right hammer to spy on the world's communications!
PRISM doesn't spy on the world's communications. It automates FISA warrant compliance, you're probably thinking of one or more of the many other NSA systems out there.
