Now it is almost certain that Apple will release OS X 10.6.5 at the same time or even before iOS 4.2. Earlier we reported that iOS 4.2 went gold and is expect to be released in a weeks time-frame. Now 9to5Mac reports that Apple has already released the OS X 10.6.5 update internally in the Apple head quarters. OS X 10.6.5 update improves reliability with Exchange, resolve delay between print jobs, iPhoto improvements and more. The leaked list does not mention any preparations for iOS 4.2 interoperability.
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The final 10.6.5 release is according to 9to5Mac the build (10H568) developers got on Halloween.