After releasing OS X Mountain Lion 10.8.4 to the public in early June, Apple has seeded the first beta of OS X 10.8.5, Build 12F9, to developers. According to 9to5Mac, Apple has also seeded the 10.8.5 beta to its Retail Team.
Apple also released a developer preview of OS X Mavericks last week, which is expected to be released to the public this fall.
The update is available through the software update tool in the Mac App Store and Apple's Developer Page.
Top Rated Comments
"And the second mouse gets the cheese"
Updated kernel extensions and frameworks in this delta update (newer than in 10.8.4 GM):
e.g. Lion had fast shutdown speed, so why can't Mountain Lion have similar or slightly slower shutdown than Lion - e.g. Lion shuts down in 2-3 seconds whereas Mountain Lion shuts down in 20-30 seconds. No matter what people say about the time needed to shutdown lots of processes, it does not explain why Mountain Lion's shutdown is so much longer than Lion's.