updated 12:53 am EST, Fri January 31, 2014
Forthcoming update edges closer to release, continues to fix issues
Late on Thursday, and just a week after the previous release, Apple has seeded a fourth beta of the upcoming OS X 10.9.2 Mavericks to developers, again focusing on issues in Mail (specifically related to Smart Mailboxes and Gmail compatibility), Messages, graphic drivers, VoiceOver and VPN. In addition, Apple has asked developers to test SMB2 network file sharing, which replaced the long-standing Apple File Protocol when Mavericks was released.
The new build -- 13C48 -- is just four up from the third beta, suggesting that Apple is making steady progress towards a formal release, which is currently expected sometime in early March. The update has some as-yet-undocumented minor changes, presumably to address problems in the last beta that sources told MacNN rendered it "nowhere near" a final release. For the last beta, Apple asked developers to focus on accessibility controls, autofill, dragging tabs between monitors, general website compatibility, printing and emailing from Reader, and extension compatibility.
The fourth beta can be downloaded through Software Update or the Apple developer website for registered Mac developers.