Son of Kal-El is continuing the Tales of Metropolis backup story from the current Superman run.
I would assume that story has to end at some point, and since Legion of Superheroes is tied to Jon now I can see them adding them over Ambush Bug and Jimmy Olsen.
"It's fun and it's cool, so that's all that matters. It's what comics are for, Duh."
Words to live by.