Apple is rapidly running out of time to make their promise that iOS 4.2 would launch in November. The company released a new gold master build for iOS 4.2, 4.2.1, late Thursday. As opposed to the earlier re-released GM build, which was for iPad only, this build is across all devices supported by iOS 4.x. The build is number 8C148, and reportedly fixes major Exchange and audio issues that have been documented on Apple’s developer forums. Normally we would expect this to delay the release of iOS 4.2 by another