Apple has internally seeded two upcoming updates to Mavericks, OS X 10.9.1 and OS X 10.9.2, to its employees, according to a source that spoke to 9to5Mac



From MacRumors:

Reportedly nicknamed "Board," OS X 10.9.1 will be released later in the month to fix several bugs introduced with OS X 10.9. Since the release of Mavericks, users have reported several different issues, with the Mail app, mostly related to Gmail accounts. Apple has already seeded an updated Mail app to its employees and AppleSeed members, and it is possible that a Mail fix could be bundled into the next public Mavericks release. Apple is also said to be preparing updates for issues within Safari, iBooks, and Remote Desktop.

  Apple Seeds Two New Mavericks Updates to Employees for Testing