Mac OS X Puma build 5G27

Mac OS X Puma build 5G27 is a beta of Mac OS X Puma 10.1. Besides changing the branding of this build to "10.1 (pre-release)" in the About This Mac dialog, not much has changed over the previous builds. The water-splashing video played on the OOBE doesn't work, leading to a white background on the left.