updated 10:49 pm EST, Wed November 6, 2013
Mail, iBooks patches also on the way, 10.10 also continues testing
Apple is said to be working on two concurrent Mavericks updates, 10.9.1 and 10.9.2, according to reports. The first of the updates will likely see release later this month to address bugs found in the first Mavericks release. In addition, the company plans updates for some individual apps, including iBooks and Mail, both of which have seen reports of performance problems for some but not all users. Apple is meanwhile continuing to test the next major OS X release, 10.10.
The 10.9.1 update has been tested internally for some time, but may soon reach AppleSeed developers and other testers. The 10.9.2 update is said to also feature bugfixes but may bring minor feature changes as well, much as the 10.7.2 and 10.8.2 updates did. Both of the previous releases made small changes to bring more parity between iOS and OS X, reports 9to5Mac.
Given the track record, OS X 10.9.2 would be likely to add some "missing" features that didn't come with the initial release of Mavericks but which already exist on iOS 7, such as FaceTime Audio and iMessage blocking features. The latter release may also herald the first wave of upgrades to Apple's iWork suite of apps, which were recently re-written for feature parity across platforms at the cost of some minor features that had been present in the previous version. Users still have access to their older versions of iWork apps, so the feature omissions in the new versions - which offer greater cross-platform parity as well as Windows compatibility - are not too serious of an issue.
The same source also reveals -- confirmed by increases in server logs on various websites -- that the next version of OS X, provisionally known as 10.10 and under the codename "Syrah," is undergoing wider testing. Syrah is expected to be released in late 2014, but such early testing would indicate that it will receive a preview at the next Worldwide Developers' Conference, usually held in June.
Also on deck for further work are updates to iOS 7. The report characterizes them as both a "bugfix" release as well as updating Apple's "iOS in the Car" functionality. No release window has yet been revealed for those updates.