In a rather odd move, Apple this evening seeded Mac OS X 10.6.6 to developers, before 10.6.5 has even been released. 10.6.5 has been in testing for a while now, with one of the main additions being support for iOS 4.2 to print wirelessly via any printer attached to your Mac or the network your Mac is connected to.
Apparently, 10.6.6 includes initial support for the installation and update mechanism for the Mac App Store.
This is pure speculation, but I believe 10.6.5 will be hitting Software Update very soon. As in Friday, 5 November soon. With iOS 4.2 going Gold Master on Monday for developers, iOS 4.2 compatible iPad apps hitting the iOS App Store on Wednesday, and a nasty Daylight Savings bug residing in iOS 4.1, with the United States ending Daylight Savings on Sunday, 7 November.
Let’s face it, it wouldn’t be surprising at all if Friday, 5 November were the day we see Mac OS X 10.6.5, iTunes 10.1, and iOS 4.2.