Great observations, Mr. Crisp. A caveat: Dusk is an existing character, so Johns didn't name him, although he did choose him.
If Dusk did represent Batman and Farmer represented Superman, then we have Batman investigating the "killing" of Superman. The zap that put him in a coma could stand in for that. Though I anticipate that Superman will be getting up from that zap very soon, so the current moment of Batman on his feet and Superman laid low seems likely to represent a very short time in the story rather than the major arc.