Build 10J858 was released as a 1008.8MB combo update and a 434.4MB delta update. According to people familiar with the beta, the update was released with no known issues as usual, though the Safari web browser has been added to the list of Focus Areas.
In addition to Safari, Apple has asked developers to look into the Mac App Store, Airport, Bonjour, SMB and Graphics Drivers.
Mac OS X 10.6.7 is expected to have only minor fixes and few new features, as Apple plans to release a major operating system upgrade, Mac OS X 10.7 Lion, this summer. Lion will incorporate features such as a home screen and full-screen applications from the Apple's iOS back to the Mac.