As noted by 9to5Mac, Apple has seeded build 12F13 of OS X beta 10.8.5 to developers, one week after releasing the first beta of 10.8.5.
The update comes with no known issues and can be downloaded via Apple's Developer Page or through the software update tool in the Mac App Store.
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And the new MacBook Airs are being sold 10.9DP1, then? Because they do support 802.11ac...
What I mean is this timeline:
10.8.4 (no 802.11ac yet) ---> Branch custom build for Airs with 802.11ac ---> merge 802.11ac into mainline for 10.8.5
Maintaining two custom versions of 10.8.5 (one for computers with 802.11ac and one without) makes no sense. It's more work for nothing. They had to have a custom build of 10.8 for the Airs for the launch, but believe me, at the first chance they get, they're gonna merge both branches. It makes sense that 10.8.5 is the merged build.
A part of me wants to die when I see the above posts; 'no issues' means 'no known regressions' - that is, new problems introduced by the update when compared against the previous release.
It is a feature, not necessarily a benefit.:)
802.11ac is not officially supported in 10.8 to begin with. Supported in 10.9.