With iTunes 7.2, preview and purchase iTunes Plus music—new higher-quality, DRM-free music downloads from participating music labels.
At the moment, there's no change in the iTunes Store. No copy protection free music, but it's late in the day. Apple will likely make one tomorrow California time. Right now, it's 11 PM and May 29th still. Even so, you can still download the new version from the download link above.
I won't repeat what has been posted a million times on the Net already, but the copy protection free music will also be twice the quality as well, 256 vs 128 AAC. The details are in this AppleInsider web page, as well as a link to a Wiki page that lists many of the artists that are EMI.
Edit to add: I see Windows Vista is now officially supported as well. Until now, Vista was not supported 100% by iTunes.