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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.

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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 We will have a running list of changes in this post (below).

New iPhoto version in Mavericks:

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– Major performance enhancements in Mavericks