Approximately one week following the previous beta release, Apple has provided build 13D43 of the upcoming OS X Mavericks 10.9.3 to developers. The update is available in the Mac App Store Software Update section for those on earlier betas and can also be found on the Mac Developer Center website. Apple has not announced when 10.9.3 will be publicly released. Indications from those using the beta point to the update providing improved support for 4K external displays and improved syncing with iTunes. Thanks, D!