Appleinsider claims that retail Mac OS X boxes will start shipping with Mac OS X 10.4.2 sometime this month. Meanwhile, the Mac OS X update should be released this week:
Mac OS X 10.4.2, which is due for release from the company this week, will reportedly deliver over 80 fixes and enhancements to Tiger, in addition to those included with Mac OS X 10.4.1.
Fixes listed include graphics drivers, Finder updates, improved autologin as well as changes to various core applications including Address Book, Automator, Core Graphics, Core Audio, Core Image, iCal, iChat, Mail, Safari, and Stickies.
Apple reportedly seeded Mac OS X 10.4.2 Build 8C29 this past weekend. There are "no known issues" with the update at the time of seeding.