Apple seeds new OS X 10.9.1 beta: Developers, come and get it!
Apple has posted a new beta version of OS X 10.9.1, marked as build 13B40. The new release is current available for pre-release testing by registered Mac developers.
Apple covers notes related to the release under its non-disclosure agreement with developers, so we won't report them here. But if you're a registered Mac developer, get yourself over to the Apple Developer Center for more information.