Posted: September 15, 2010
iOS SDK 4.2 beta requires Mac OS X v10.6.5 pre-release to test printing from your app.
iOS 4.2 beta should only be installed on devices dedicated exclusively for iOS 4.2 beta testing. Do not install this software if you do not have a device dedicated exclusively for iOS 4.2 beta testing.
iOS SDK 4.2 beta, iOS 4.2 beta, Mac OS X v10.6.5 and Xcode 4 developer preview are pre-release software and are considered Apple Confidential Information
It goes without saying ...... if you care about jailbreak and/or unlock , stay away