updated 06:30 pm EDT, Mon April 21, 2014
Latest release has minor tweaks, same focus on testing
Just six days after the previous release, Apple has pushed out the eighth beta of OS X Mavericks 10.9.3 to developers for testing. Other than minor tweaks and fixes, the only thing different about the latest version is its build number, 13D45a -- just two build versions older than the previous one, and with an "a" appendix for unknown reasons. The numbering suggests that the update is nearing "golden master" status, with no known issues listed.
As before, the company asks testers to focus on any remaining issues with graphics drivers, audio, Mail, Safari, and the re-introduced feature of local syncing of Contacts and Calendar data through iTunes to local devices. Also introduced in recent builds is preliminary support for pixel doubling for 4K external displays.
The feature, a bonus for owners of the latest MacBook Pro models, effectively brings "Retina" screen quality to existing 4K monitor support, as well as expand the number of potential brands of monitor supported. The pixel-doubling will likely expand to other machines in future releases. A final release date is unknown, but those with registered developer accounts can obtain the update through the Mac App Store's Software Update or the Apple Developer portal on its website.