OS X 10.9 Build Number Suggests Extensive Internal Development

While many had expected Apple to follow last year's pattern and release a developer preview of OS X 10.9 early this year ahead of a summer public launch, the company has so far remained essentially silent about its plans for its next-generation Mac operating system. That silence does not, however, mean that Apple has not been working hard on the project since it first started showing up in web logs last fall.

As spotted by an AppleInsider reader, circumstantial evidence of Apple's work showed up in a WebKit bug report early last month revealing that version of OS X 10.9 in testing was Build 13A451. According to Apple's build number scheme, "13" refers to OS X 10.9, "A" refers to the 10.9.0 version, and "451" is part of a sequential numbering of compiled builds.

federighi_wwdc_mountain_lion

Apple Senior Vice President Craig Federighi introducing OS X Mountain Lion at WWDC 2012

AppleInsider speculates that the relatively advanced "451" build number as of early May could indicate that Apple would be able to deliver a fairly mature version of OS X 10.9 to developers at its Worldwide Developers Conference next week, although there is no formal evidence for such a claim.

OS X Mountain Lion's initial developer preview arrived as Build 12A128p in February 2012, with Apple releasing several additional builds to developers before releasing it to the public as Build 12A269 in July of that year. OS X Lion apparently spent a longer time in overall development but a similar amount of time in developer testing, beginning developer seeding with Build 11A390 in February 2011 before being launched to the public as Build 11A511 roughly five months later.

Apple had indicated when it launched its first developer preview of OS X Mountain Lion last year that it was shifting to a more rapid yearly development cycle for OS X in order to bring more features to consumers more quickly. But with Apple yet to have begun seeding developers with versions of OS X 10.9 and the company reportedly having pulled engineers from OS X to work on iOS 7, there have been some questions about how closely Apple will be able to stick to its yearly release plan.

Top Rated Comments

(View all)
Avatar
94 months ago
Wait... so they've been working on OS X 10.9 this ENTIRE TIME?! I thought they just looked at their watches, said "Crap WWDC is in like 3 weeks!!", and then threw some code together.... :rolleyes:
Score: 37 Votes (Like | Disagree)
Avatar
94 months ago
I'm really not even looking forward to this at all. OSX announcements used to be exciting, but newer features like Launchpad and Mission Control do not add anything to my experience whatsoever. Even the under the hood improvements rarely seem particularly interesting anymore. I still get every new version, but that's mostly because I feel forced to for compatibility reasons.

Honestly, without a fundamental change to the way the computer works (something one might expect in an OSXI, not an 10.9), I don't even know what features I would like them to add anymore.
Score: 22 Votes (Like | Disagree)
Avatar
94 months ago
Score: 21 Votes (Like | Disagree)
Avatar
94 months ago

Release it at WWDC. Screw the developers!

That's a really bad idea
Score: 20 Votes (Like | Disagree)
Avatar
94 months ago

I'm really not even looking forward to this at all. OSX announcements used to be exciting, but newer features like Launchpad and Mission Control do not add anything to my experience whatsoever. Even the under the hood improvements rarely seem particularly interesting anymore. I still get every new version, but that's mostly because I feel forced to for compatibility reasons.

Honestly, without a fundamental change to the way the computer works (something one might expect in an OSXI, not an 10.9), I don't even know what features I would like them to add anymore.


Personally, I consider full-screen apps and Mission Control to be a huge difference in the way my computer works. Just because you don't use these features doesn't mean lots of others don't. For me, it's completely changed the way I use OS X.
Score: 20 Votes (Like | Disagree)
Avatar
94 months ago

Be prepared to be amazed with over 200+ new features, again


Only 1 of which you'll ever actually use.
Score: 18 Votes (Like | Disagree)

Top Stories

Supposed iPhone 12 Display Unit Leaks

Thursday August 6, 2020 8:13 am PDT by
An image supposedly of an iPhone 12 display unit has been shared online by leaker "Twitter user Mr. White". Compared to images of an iPhone 11 Pro display piece, this new unit has a reoriented display connector, reaching up from the bottom of the display, rather than from the left-hand side on iPhone 11 Pro. This may be due to the logic board moving to the other side of the device. A...

8 Third-Party Home Screen Widgets That You Can Try Out Now on iOS 14

Wednesday August 5, 2020 12:56 pm PDT by
One of the biggest new features of iOS 14 is Home Screen widgets, which provide information from apps at a glance. The widgets can be pinned to the Home Screen in various spots and sizes, allowing for many different layouts. When the iOS 14 beta was first released in June, widgets were limited to Apple's own apps like Calendar and Weather, but several third-party developers have begun to test ...

Apple Seeds iOS 14 and iPadOS 14 Public Beta 4 to Testers

Thursday August 6, 2020 10:05 am PDT by
Apple today seeded new public betas of upcoming iOS 14 and iPadOS 14 updates to its public beta testing group. Today's software releases, which Apple labels as fourth betas to keep them in line with developer betas, are actually the third betas that Apple has provided and they come two weeks after the prior beta releases. Public beta testers who have signed up for Apple's beta testing...

Apple Takes Legal Action Against Small Company With Pear Logo

Saturday August 8, 2020 11:09 am PDT by
Apple is taking legal action against the developers of the app "Prepear" due to its logo, according to iPhone in Canada. Prepear is an app that helps users discover recipes, plan meals, make lists, and arrange grocery deliveries. The app is a spinoff of "Super Healthy Kids," and the founders claim that they are facing litigation from Apple. Apple reportedly takes issue with Prepear's logo, ...

Google's $349 Pixel 4a vs. Apple's $399 iPhone SE

Wednesday August 5, 2020 1:45 pm PDT by
Google this week launched its newest smartphone, the $349 Pixel 4a, a low-cost device that's designed to compete with other affordable devices like Apple's iPhone SE. We picked up one of the new Pixel 4a smartphones and thought we'd check it out to see how it measures up to the iPhone SE, given that the two devices have such similar price points. Subscribe to the MacRumors YouTube channel ...

2020 iMac Benchmarks Surface Online [Updated]

Thursday August 6, 2020 7:16 am PDT by
Benchmarks from the new 2020 iMac have today been shared online by Mac Otakara. The Geekbench benchmarks are from the newly-released 27-inch iMac with 3.0GHz Intel Core i5 processor and Radeon Pro 5300 graphics, compared to multiple specs of the previous 2019 iMac. The lowest spec 27-inch i5 iMac from 2020 performs about 20 percent better in multicore than the lowest spec 27-inch i5...

New 27-Inch iMac's Storage Affixed to Logic Board, 4TB and 8TB Configurations Have Expansion Connector

Friday August 7, 2020 7:46 am PDT by
Following a report from German blog iFun.de that claimed the new 27-inch iMac's flash storage is soldered to the logic board, MacRumors has obtained additional information in an internal document for Apple technicians. In the document, Apple says that the flash storage is indeed affixed to the logic board and cannot be removed. However, for the 4TB and 8TB configurations, Apple says that a...

Microsoft's xCloud and Xbox Game Pass Not Coming to iOS Due to Apple's Restrictions [Updated]

Thursday August 6, 2020 1:06 pm PDT by
Microsoft's "Project xCloud" streaming game service that pairs with its Xbox Game Pass won't be available on iPhone and iPad when it launches this September, and Apple's App Store restrictions are to blame. Xbox Game Pass and its accompanying xCloud streaming feature offer access to hundreds of games that can be streamed to mobile devices, and Apple says that because it can't review each...

Apple Announces New 27-Inch iMac With 10th-Gen Processors, Up to 128GB RAM, 1080p Webcam, True Tone, and More

Tuesday August 4, 2020 8:07 am PDT by
Apple today announced a new 27-inch iMac with faster 10th-generation Intel Core processor options, next-generation AMD graphics, up to 128GB of RAM, a higher-resolution 1080p front-facing FaceTime camera, a True Tone display with a nano-texture glass option, a T2 chip, higher fidelity speakers, studio-quality microphones, and more. A breakdown of the new 27-inch iMac's features and specs:10th...

Samsung Launches Galaxy Note 20, Galaxy Z Fold 2, and Galaxy Buds to Compete With Apple's iPhones and AirPods Pro

Wednesday August 5, 2020 10:07 am PDT by
Samsung today held a virtual Galaxy Unpacked event where it unveiled its next-generation smartphones that will compete with Apple's 2020 iPhone lineup, set to come out in the fall. Samsung announced the launch of the Galaxy Note 20 and the Galaxy Note 20 Ultra, the two newest devices in the Note lineup, and, more notably, the Galaxy Z Fold 2, Samsung's latest foldable smartphone. The...