He teased that Superman and the GLC would team up to fight the Revenant Queen when he first mentioned her over in Action. I could see Action and his GL book crossing over for that. Otherwise he’s teased that he wants to do a long Jurgens tier run on Action, and if he got to do that all of his plot threads would culminate in a big story for the ending. Given how cosmic his run has been, and how stuff in Action is likely going to matter for John GL, I can see his big finale for these books being a crossover event that wraps up all his cosmic storylines. Of course that’s if he gets to stay on the books for as long as he wants, do what he wants, and people keep liking his writing for the characters, so we’ll see how his John is in an ongoing.
I’d be happy just to have him give John a new LI