Apple Launches iTunes Plus

From Too Poppy:

Apple launched iTunes Plus today, which features higher-quality DRM-free tracks for only $1.29 rather than the $.99 for regular tunes. I'm not sure I hear a big difference, but I like the option and the fact that you can upgrade previously purchased tracks is tremendously well thought-out. That kind of post-purchase flexibility is what makes the digital format superior over CDs (ever buy a whole album twice because the second version is remastered or features additional tracks?)

As a bonus, Apple took the opportunity to announce that "more than a dozen" of Paul McCartney's catalog is now available in both formats. Excellent, but "more than a dozen?" Why not "all?"