OK, here's the scoop: It's being staged in plain sight: ftp://releases.mozilla.org/pub/mozil.../releases/3.0/

And they have a nice index.html saying the files are not for you, pointing out that "Downloading them directly can harm our ability to distribute Firefox efficiently, and will also not be counted as part of our attempt to set a Guiness World Record for the most software downloads in a day.", and pointing to a progress page.

My plan? Install now, redownload later to even up the ******ed ego-boosting record attempt. But you, OTOH, should not do that, because if we all do, we'll slashdot them once prematurely, and then again on time...