“Syrah†is available as an operating system newer than Mavericks and the recently released OS X Mountain Lion 10.8.5…
According to Mark Gurman of 9to5Mac:
Emphasizing the fact that OS X 10.10 is still very early in development is its current build number. We’re told that OS X 10.10 has seen approximately 30 seeds so far in development. For comparison, the first OS X Mavericks Developer Preview was build 476, while the first OS X Mountain Lion and Lion Previews were build numbers in the 100s range and 400s range, respectively.
Gurman in another report quoted sources who described Syrah “akin, but not as dramatically different, to the new designs found in iOS 7 and iCloud.comâ€. Development of iOS 8 is also reportedly making headway. Not much is known about iOS 8 except perhaps some notable feature enhancements to Maps, such as the car-finding feature.
OS X Mavericks is on-track for release in the later half of October, and it will be available via the Mac App Store. Apple is yet to announce a release date or pricing information, but the company is holding an earnings conference call on October 28th. Historically, Apple has provided final release details for its new operating systems during the prepared remarks portions of these financial announcements.