Wow. Good link, but I thought this wasn't supposed to be available until tomorrow?

The link isn't published yet, but they use a predictable URL for the mp3 file so it is not difficult to find. This sort of early reveal is probably frowned upon by the organization that produces the radio show, though.

I'll admit that I let my curiosity overtake my sense of ethics in this case. :/

In my experience, they're available as soon as WBEZ finishes airing them for the first time.