The Mac OS 9 update that was posted on Apple's servers was meant for internal testing and not for general release, according to a ZDNet story.
"Sources close to Apple" told ZDNet that the Mac OS 9.4 updater is not set for official release until some time this week. Some users, however, have been able to download the updater or access it through the Software Update control panel.
The update is said to contain the same bug fixes and tweaks as the system software shipped with the latest hardware - the new iBook, iMac DV and PowerBook.
This includes the latest versions of FireWire and USB extensions, Sound Manager fixes, and enhancements to the Mac OS ROM andPowerPC Enabler files, as well as the Script Editor and ATI drives.