updated 10:00 pm EDT, Thu September 5, 2013
Continued progress on seventh 10.9 beta, but no formal release date yet
On Thursday, Apple made available to developers the Server version of Developer Preview 7 of Mavericks (OS X 10.9), as well a previously-missing component of the forthcoming Mac OS upgrade known as Windows Migration Assistant, which helps transfer settings and data from users who are coming to the Mac from a Windows machine. The email from Apple also reminded developers of yesterday's OS X Mountain Lion 10.8.5 update, which is nearing completion as evidenced by its single-digit build number change.
OS X Server Preview 7 for Mavericks features a build number of 13S357E and asks testers to focus on Wi-Fi, wake from sleep, PDF viewing, accessibility and graphics -- the latter a frequent focus of the Mountain Lion update program owing to a number of glitchy Nvidia graphics cards that have been known to cause problems. Also on the list to be examined in the new build is mobile device management. The Windows Migration Manager is now at version 22.214.171.124, but was strangely not included in the new Developer Preview of Mavericks issued on Tuesday.
The Mountain Lion 10.8.5 update is available as a combo download or delta (just the modified aspects) update. Both are available through Apple's developer portal or through developer accounts in the Mac App Store.