Prediction:
1. OS 10.6.5 releases LATER THIS WEEK, not tomorrow. Too quick to turn around a new beta from today to release tomorrow, give it at least 48-72 hours.
2. iTunes 10.1 releases LATER THIS WEEK.
3. AppleTV 2 receives an update LATER THIS WEEK.
3. OS 4.2 releases NEXT TUESDAY, NOV 16. This will have allowed a reasonable number of people to get the above updates over the weekend, all of which are needed for the full OS 4.2 experience.
I see almost no way OS 4.2 arrives tomorrow unless Apple is in the business of releasing a new OS X seed on Monday and then releasing the final version to the public the next day along with a new iTunes, new Apple TV update AND a major, major OS update to their premiere holiday products all at the same time.
That won't happen.