Apple Promises Big iTunes Announcement Tomorrow: What Is It? [Open Thread]

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If you surf on over to iTunes right now, you'll see a message reading: "Tomorrow is just another day. That you'll never forget. Check back here tomorrow for an exciting announcement from iTunes." You got us, Apple -- we're intrigued.

So what do you think the news pertains to? Could iTunes finally be releasing a music subscription service to rival pre-existing options like MOG and Spotify? Is a web-based version of iTunes on the way? Or is something else entirely on the horizon?