Without being able to look myself, I would have to guess that the queen cell does not have a viable "female" larvae in it.. i cant actually see any larvae in it at all, but it may be the picture...
Are there multiple eggs per cell, or is there still a queen thats laying unfertilized eggs?
From the pattern i would almost guess that there is a queen that has run out of sperm, but as I said, its hard to tell without being able to look...
Irregardless, At this time of the year there is not much that can be done. If it was mine, I would shake them out and freeze the frames for the bees to re purpose/clean next spring.
If there is a queen, I would axe her before shaking them out.
By the way, dont AXE the queen and toss her in the garbage, or you may find a few hundred bees collecting on your garbage can after you shake them out.
Lets see what everyone else says.