MacRumors posted a story that according to 9to5Mac, early builds are showing that both Siri and Maps are being integrated into the newest version of the Mac operating system.

A release date for OS X 10.9 is currently unknown, but Apple has stated that is moving toward a more rapid development cycle on OS X. If Apple follows their pattern for OS X 10.8's launch, we could see early OS X 10.9 developer previews in early 2013 and a final release in the middle of the year.

  OS X 10.9 to Include Siri and Maps Integration