Apple has seeded the first beta of OS X Mavericks 10.9.1 to developers



From MacRumors:

The release asks testers to focus on Mail, Graphics Drivers and VoiceOver, though there are no known issues with the release. Earlier this month, Apple released a special update to Mavericks to address issues using Gmail with the Mail.app client built into the OS.

  Apple Seeds OS X Mavericks 10.9.1 Beta to Developers