From his blog (also here):
I am not ready to talk about what I am working on with the startup studio, and probably won’t be ready to talk about for many months to come. It will be online, I can tell you that much.
As you might guess, I am not pursuing a CD nor a sub fee for what I do next.
CD stands for CD. The disk.
I guess it means something online and as a small download, if it needs one.