MacRumors reports that Apple is making preparations to begin seeding builds of OS X 10.8.1 to developers

The first maintenance updates for OS X releases tend to come fairly quickly after their initial debuts, due in part to a need to move some of the major bug fixes to the public as quickly as possible. Apple has also likely been working on OS X 10.8.1 since some time prior to the launch of Mountain Lion, as it seeded the final version to developers over two weeks ahead of the public launch and undoubtedly continued to find issues requiring attention after that time.

  Apple Preparing to Seed Developers with First Build of OS X 10.8.1