From what I read and have heard, It all basically stems from Radionomy. Considering they have control of Shoutcast and winamp now. I have tried contacting them, but have received no response from them at all, (this was about a week or 2 ago).
If they have all control of ShoutCast, don't really know how long it will take them to get things situated for the MP3 license keys.
If you can find a way to contact them and get an answer, please do.
How to get MP3 license key