According to this post by Chris Hofmann, Firefox 1.0 for MacOS X will ship with the Windows and Linux releases on November 9th! He says:
Ben, Asa and I met to review a plan for synchronizing the Mac 1.0 with the Windows and Linux releases on 11/9. We looked at feedback and satisfaction data from version tracker and other sources, recent Mac specific bugs fixed and decided to move forward with a plan to ship Mac Firefox 1.0 on 11/9. The hard and anecdotal data shows the satisfaction rating of Mac Firefox to be very close to Safari, and we see many users choosing Firefox over Safari which is a clear sign that we should be calling it 1.0.
For more details on how the MacOS X specific issues are going to be handled in the short time prior to release, read the post.