updated 08:26 pm EST, Thu February 6, 2014
No final release date, no significant changes from previous beta
Developers can now download the fifth version of OS X Mavericks 10.9.2, an upcoming maintenance release, from Software Update through their registered developer accounts, or from the Apple developer portal. The latest update has no significant changes in the release notes, but again asks developers to focus on networking, Mail, Messages, VoiceOver, VPN and graphics drivers. The new build, 13C53, comes one week after the previous release.
Apple is beginning the process of switching the default networking schema from Apple File Protocol (AFP, in use for decades) to SMB2 (a more modern standard and fully compatible with Windows). OS X Mavericks has also had ongoing issues with Gmail integration in Mail and semi-functional Mail alerts and Smart Mailboxes -- thus the particular focus in the last few betas on networking and email.
As is usual, there is no indication of a final release date, though sources have said to look for 10.9.2 to be ready in early March. Betas of OS X releases have been known to reach into the double-digits of versions before finally going public, and one tester told MacNN that as of two versions ago, the 10.9.2 update is "nowhere near" ready for release.