Apple has pushed out a newer pre-release version of 10.9.3 beta and iTunes 11.1.6 beta to employees. The new pre-release of OS X 10.9.3 (build 13D19) is available to employees and doesn’t introduce any major changes since the latest beta build seeded to developers. The last beta release asked developers to focus on testing graphics and audio drivers.
iTunes 11.1.6 brings fixes for the latest 10.9.3 builds and “restores the ability to sync contacts and calendar information to your iPhone, iPad, or iPod touch from a Mac running OS X 10.9.3.” The ability to sync contacts and calendar data to an iOS device from a Mac was removed previously but remained possible through iCloud syncing.
The final release of 10.9.3 could bring support for driving 4K displays at Retina resolution and 60Hz output from 2013 MacBook Pros.