The new unrestricted format appears to be open to any publisher who is interested.
Is Apple saying this is going to be a new music format other than MP3 for these DRM free tracks? OR It's a new format of iTunes store?
The reason I ask is because of the lawsuits that are going on with the MP3 licenses. I can see why Apple would want to get away from MP3's, but if it's a new format then it will mean DRM free music, but not interoperable if they only play on an iPod.