I can't yet though Windows Update. I will keep trying.
If you are waiting like I am, you can read this article in the meantime.
Update: I never did get to Windows Update. I couldn't wait and I downloaded it. I really have no comments about it at this time good or bad. It is an install during which you're best to do something else while you wait. I didn't time it but it purported to take an hour and I'm inclined to believe it. After the last reboot, Vista returned seemingly no worse for the wear.