The latest DC Direct Channel newsletter has more shipping changes for Final Crisis.
Final Crisis #4 has been pushed back again to October 22, and the next few issues have been rescheduled accordingly. That puts Final Crisis #5 on November 26, and Final Crisis #6 on December 31. (FC6 isn’t on the list, but the new date is on DC’s website.)
So it looks like December will have an issue of Final Crisis, after all.