Early in October, Apple released the "final" gold master version of OS X 10.9, also known as Mavericks, to Mac software developers. Usually, that means that no other updates for the OS will be released until after it becomes available to the general public. This weekend, that normal process was broken thanks to Apple releasing another software update for OS X Mavericks.
As 9to5Mac reports, the new update brings the build number of OS X 10.9 to 13A603, compared to the gold master build number of 13A598. The update is being offered to people who are installing Mavericks for the first time and is not available via Apple's Developer Portal nor from its Software Update feature.
While there are no release notes for this update, it's likely that Apple found some last minute bugs between the gold master and now, effectively making this a "day one" update for Mavericks.
Apple is likely to launch OS X Mavericks to the general public later this coming week, perhaps on Tuesday as part of its press event. Apple could also announce some new Mac PC products during the media event such as the updated Mac Pro that's the subject of a recent ad teaser campaign that ran in movie theaters.
Source: 9to5Mac | Image via Apple