Apple Releases OS X Mountain Lion Developer Preview 4

Osxdp4
Apple released new versions of OS X Mountain Lion to developers today. Developer Preview 4 arrives with a build number of 12A239, while OS X Server Developer Preview 5 has build number 12S254j.

The release notes do not reveal any major updates to the software, but note a few minor issues with Setup Assistant, FileVault and QuickTime screen recording. Most significantly, the release does not ask developers to focus on any specific areas for testing, suggesting Mountain Lion will indeed be ready for release next month.

Mountain Lion was covered extensively at the WWDC Keynote this morning. It will be released in July on the Mac App Store for $19.99.

Top Rated Comments

RoelJuun

187 months ago

I just don't want Apple to rush Mountain Lion, fix all the bugs first and release it when it's ready. And write some great drivers for the older models too please, don't focus only on your newest creations.

Score: 6 Votes (Like | Disagree)

KALLT

187 months ago

Watching the keynote now... Uhh, where are the Dock indicators?

Theyre still there if you look closely.

Score: 3 Votes (Like | Disagree)

Yamcha

187 months ago

Just Installed Developer Preview 4 and It looks amazing, they've done an awesome job of making refinements on the UI..

Score: 2 Votes (Like | Disagree)

Cougarcat

187 months ago

isn't that in iOS not OS X?

Both versions got updates. OS X's received New Gesture-based tab navigation, unified bar, and cloud tabs.

Score: 2 Votes (Like | Disagree)

Cougarcat

187 months ago

no safari update?

Yes, Safari 6...

Score: 2 Votes (Like | Disagree)

GIZBUG

187 months ago

im assuming we will see a GM build next than the final? as for Facebook integration.. maybe 10.8.1?

FB is already integrated..............

http://www.cultofmac.com/173035/apple-releases-os-x-mountain-lion-developer-preview-4-with-facebook-integration/?utm_medium=twit&utm_campaign=spread-us

Score: 2 Votes (Like | Disagree)

Read All Comments

Popular Stories

Home Hub Command Center with Dome Base Feature

Apple Smart Home Hub to Feature iMac G4-Style Design

Wednesday September 30, 2026 4:36 am PDT by Hartley Charlton

Apple's long-rumored smart home hub will have an iMac G4-style design and a host of unique features, Bloomberg's Mark Gurman reports. The smart home hub is said to feature a square 6-inch display, with variants that can be placed on a countertop or mounted on a wall. It features a single FaceTime camera on the front, with microphones and speakers in its connected base. Gurman described the...

• 203 comments

Three New Apple Smart Home Products Coming on October 13

Wednesday September 30, 2026 4:04 am PDT by Hartley Charlton

Apple plans to introduce a series of new smart home products on Tuesday, October 13, according to Bloomberg's Mark Gurman. Apple reportedly plans to debut its long-awaited smart home hub device, a new HomePod mini, and a new Apple TV on the date. The new HomePod mini and Apple TV are set to retain their existing designs, but tout faster chips to support Siri AI. The new HomePod mini will...

• 56 comments

New Apple TV 4K Leaked

Friday September 25, 2026 8:16 am PDT by Joe Rossignol

MacRumors contributor Aaron Perris has uncovered an image file from Apple for an unreleased Apple TV 4K, suggesting that a new model will finally be released soon. The image is specifically for an "Apple TV 4K (4th generation)" model. Apple TV 4K (4th generation) image (on a gradient) The image reveals that the Apple TV will have the same external design as the current model, with all of its...

• 194 comments

Apple Releases OS X Mountain Lion Developer Preview 4

Top Rated Comments

Popular Stories

Apple Smart Home Hub to Feature iMac G4-Style Design

Three New Apple Smart Home Products Coming on October 13

New Apple TV 4K Leaked

Next Article

Videos

Guides

Upcoming

Other Stories

🔗 Related Apple News & Rumors