Six weeks after the release of OS X 10.8.2, Apple is preparing to begin testing on the next maintenance update to OS X Mountain Lion. AppleInsider notes that Apple has sent out invitations to select users asking them to participate in the testing process.
The first build of a new OS X version typically appears a few days after such invitations are sent out, suggesting that we may see the first beta of OS X 10.8.3 appearing late this week or early next week.
There is no word yet on what changes and improvements will be included in the update, and the amount of time each release spends in testing can vary significantly, so there is no estimate yet on when OS X 10.8.3 can be expected to make its way to a public release.
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I wish we could downvote on this site...
facebook and twitter integration was a big update. Also the update which fixed the battery draining issue was big and made a notable difference to users.
Tons of stuff. Although, for OS X, that's more the exception than the norm.
Off the top of my head:
10.6.6 added the Mac App Store.
10.7.2 added iCloud.
10.8.2 added Facebook integration, new Game Centre features, and a bunch of other features mostly related to integration with new features in iOS 6.
... but, in each of those cases, the features were announced and known about well in advance. I wouldn't expect Apple to introduce any "surprise" new features in a point release, and there exists nothing to indicate that there will be any new features in 10.8.3; in all likelihood, it's mostly bug fixes, with probably many of them related to features introduced in 10.8.2.