A new beta of Mac OS X 10.6.7 known as build 10J868 has been seeded to developers.
The Delta update and revisioner is a 476MB file, while the Combo update and revisioner is a 1007MB file.
Developers are asked to focus on Safari, Mac App Store, AirPort, Bonjour, SMB, and Graphics Drivers. There are no known issues with the beta, Apple said.
The release date for the final, consumer-ready version of Mac OS X 10.6.7 has not been confirmed.
A developer preview of Mac OS X 10.7 Lion, which is due to be officially released some time this summer, was issued by Apple late last month.