Apple has seeded Mac OS X 10.6.7 build 10J858 to developers for testing, according to MacRumors.
According to those familiar with the new build, Apple has added Safari to the list of areas in which developers are asked to concentrate their testing, joining Mac App Store, AirPort, Bonjour, SMB, and Graphics Drivers that had been included in previous builds. Once again, no known issues are listed in the documentation.