You must have followed at least some of the many discussions about it here. It was never present in any of the released betas (so far), just in the keynote and demo/ad materials. That's pretty much all there is to it (again, at least so far).
From the iOS 7 video played at WWDC it sure looks like the dock is more translucent than we've seen in any beta. What gives?
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That video is just an illustration (likely made with Flash or something). What you see on that video almost certainly never existed in code.
It looks like it's just a CG image.Image