I think, in theory, this is really neat. One of the things I struggle with when learning something new (especially something more involved), is finding a way to put it into practice.

With that said, I think there could be a bit more description, or perhaps some examples of what I'd actually be signing up for, and how it works.

As a bit of trivium, on Chrome on OSX, auto-fill for the email doesn't work properly, and while small, it might help get a tiny bit higher conversion if that was addressed.