According to people familiar with the matter, the 1GB download is labeled 10K531. MacStories reports that focus areas for the beta software remain unchanged: Airport, Graphics Drivers, Mac App Store, Networking, QuickTime and VPN.
Thus far, Apple has maintained a weekly release schedule with developer builds of Mac OS X. The first release came two weeks ago, and the second build arrived last week.
It is as yet unclear whether Mac OS X 10.6.8 contains a fix that will find and remove the MAC Defender malware, though Apple may likely release the fix as a standalone security update. The Mac maker promised earlier this week to release an update to Mac OS X that would resolve an issue with phony antivirus software that automatically downloads as a phishing scam looking for users' credit card numbers.
The malicious software first appeared in early May, though one noted security expert has downplayed the threat as being "simply a trick website" rather than a viral attack.
Apple released the latest update to Mac OS X Snow Leopard in March with changes designed to improve the reliability of Back to My Mac, resolve issues when transferring files to SMB Windows Files Sharing servers, and address Mac App Store bugs. Mac OS X 10.6.7 also contained fixes for Thunderbolt MacBook Pros to address "minor FaceTime performance issues" and improve "graphics stability and external display compatibility."
This summer, Apple will launch the next major upgrade to its flagship operating system in the form of Mac OS X 10.7 Lion.