Apparently it's because it won't ship until 2007.
That's alright though. I'm sure that final versions will be distributed across the web well before it comes out so that all those virus creators out there are ready for the public release.
"So, God created the world in seven days. A foolish brag, I feel. If I was God I'd say, "I'm going to create the world over a number of days. Not sure how long, might be a bit pressed, you know..."
Do it like Microsoft - "lt'll be done by Saturday, Tuesday, next week...
We'll bring it out when we're fucking ready, right?"
- Eddie Izzard