Screen Shot 2013-08-07 at 1.03.59 PM

Just over two weeks following the release of OS X Mavericks Developer Preview 4, Apple has seeded the 5th preview to developers via the Mac App Store Software Update tool.

Screen Shot 2013-08-07 at 3.46.29 PM

Also released is OS X Mountain Lion 10.8.5 build 12F33. That build comes one week after the previous 10.8.5 seed. Safari 6.1 beta 5 has also been released for Mountain Lion.

The new Mavericks beta brings iBooks app. Full tour here.

If you find anything new, you can let us know at tips@9to5mac.com. We will have a running list of changes in this post (below).

New iPhoto version in Mavericks:

Screen Shot 2013-08-07 at 1.54.28 PM

- Major performance enhancements in Mavericks

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13 Responses to “Apple releases OS X Mavericks Developer Preview 5, seeds OS X 10.8.5 build 12F33”

  1. Im beginning to think that iBooks will not be bundled with Mavericks, but will be a separate app download from the app store. Otherwise, why wouldn’t they have included it in the beta by now?

    • Steve Grenier says:

      First off, it probably will be separate, like on iOS. As for it not being included, maybe it wasn’t done? Writing apps takes time you know :)

  2. iBooks is included in this DP.

  3. I guess I should have waited till I actually updated before I commented…

    The iBooks App is here!!!

  4. Wow, that is one hideous looking app. So boring… I want my wooden bookshelf back :(

  5. I wonder if they fixed the performance issues with iPhoto. Probably not considering they never have for the last how ever many years.

  6. Lelouch-sama says:

    Scrolling in Mission Control is removed. Yeah!

  7. The limit of folders in LaunchPad has been either removed or changed.

  8. iTunes Notifications are new.

  9. ice2192 says:

    changing background went back to “Set up desktop picture” after right click. before it was “Services>Set as desktop picture”

  10. do you guys have problems with iMessages login?

  11. Hey

    I am unable to upgrade from DP4 to DP5 . AY FIX ?