OS X and Carbon
Per Lee Richardson on the FrameUsers forum ( http://www.frameusers.com ), and paraphrased here by me:
There will be no OS X native support or Carbonized version of the next version of FrameMaker.
Per Lee, work was started on developing a Carbonized version of FrameMaker for OS X, but that work was dropped from the current development cycle due to the unstable nature of the OS X operating system at the time and the possibility of needing separate FrameMaker binary files for OS X.
Per Lee, an OS-X version of FrameMaker is a priority for the release of FrameMaker after the next.