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 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.