"The Darkest Hour: Chapter Four of The Dark Ages" and the Return to the Jungle Book backup story, "Part Four of Five: Mowgli for Dinner" are contained in the eightieth issue of Fables.
Publisher's summary
Here's the thing, folks. We can't tell you what happens in this issue because it would give away the big frightening thing that happened in the previous issue (which we also didn't tell you about). So, what can we say? Only the most general stuff. Like that the grim fallout from winning the war so easily continues. And the metaphorical chickens come home to roost. Good, right?
Plot
The Darkest Hour
Bigby transforms into his full wolf form to huff and puff the dust cloud away from everyone. King Cole tells everyone that they're heading to the Farm for safety. Rose Red finds Colin's ghost who tells her that bad things are going to happen. Meanwhile everyone arrives at the Farm, while Mr. Dark is on his way to Fabletown. Rose Red becomes horrified to see Boy Blue's condition, and tells him that she and Sinbad are married. Bigby tells King Cole that they currently have no way of saving Boy Blue's life.
Mowgli for Dinner
TBA. The fifth and final part of this story is in Fables 82.