From Nikon:
We plan to test the Macintosh versions of the following software applications for compatibility with OS X version 10.9 (some older applications will not be tested). We will announce our plans regarding full compatibility once testing is complete.
We do not intend to provide compatibility with the following applications.
We do not plan to provide compatibility for other software, or for products utilizing a SCSI or serial connection. We apologize for any inconvenience this may cause. For further information regarding this matter, please contact Nikon Customer Support.