Apple has seeded developers with the second preview of OS X 10.8 Mountain Lion. The download is, again, available via the Mac App Store, and developers must get a redemption code from the Mac OS X Development Portal in order to download. Apple is yet to provide release notes for the second version, so send in what you find to tips@9to5mac.com. The build number for this new preview is 12A154q. Mountain Lion brings many iOS 5 features to the Mac including AirPlay Mirroring, Game Center, Notification Center, and a Messages client.

Update: Apple has also seeded Mac OS X 10.7.4 to developers.

  • Mountain Lion available for download (9to5mac.com)
  • Here’s a list of things that Mountain Lion killed today (9to5mac.com)
  • Apple announces Mac OS X 10.8 Mountain Lion Developer Preview with deeper iOS integration (9to5mac.com)
  • Mountain Lion isn’t a walled garden (yet), but it has a Gatekeeper (9to5mac.com)