Apple Seeds New Build of OS X Mavericks Golden Master
Apple has seeded a new build of the OS X Mavericks Golden Master to developers, a little more than two weeks after the first GM seed. According to 9to5Mac, the build is only available for users performing a fresh install of Mavericks, with some users having luck re-installing the new GM over the prior version.

The prior GM had a build number of 13A598, while the new release is build 13A603. Apple is reportedly targeting a late October launch for Mavericks and it's possible the company will give a final release date at Tuesday's media event.
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Top Rated Comments
Funny, as some users have done just that. So again, stop spreading misinformation.
Stop spreading misinformation. You don't know for sure.
not true. You can update with no issues. I updated both my laptops today..
https://forums.macrumors.com/showthread.php?t=1656469
Why do Macrumors need another thread for that?
I also tipped 9to5Mac...
Are you in need of affection or public recognition?
OS X Developer Previews do not expire.
GM builds are built to be the final version. Updates are only issued if there are major problems. Not only do Developer Preview's (betas) not expire, but a build built to be the final version definitely does not expire.