I can't get the iTunes 9 link in the article to go to a page that has the iTunes 9 download. It opens iTunes, brings me to the iTunes 9 page, but when I downloaded it the installer said iTunes 8.2.1. I guess they haven't swapped out the link yet?
I imagine it will go live once the keynote is over.
iTunes 8 is still reporting iPhone OS 3.0.1 is still current, as well, so I expect it will open up after the KN, as well.