So Marvel's upcoming event has history altered so that many of their major characters didn't get their powers or special abilities or got drastically different ones. In this new world the major heroes are actually The Squadron Supreme. If that sounds like Marvel is trying to do a stealth Justice League story it doesn't end there you've got a tie-in revolving around a young Hyperion going off on adventures with the Imperial Guard (basically Superboy and the Legion of Superheroes) and tie-in revolving around Peter Parker and Hyperion which very much looks like a riff on Superman's Pal Jimmy Olson.
Given that the comics serve as something like idea test kitchens for concepts and characters in the movies would it really be surprising if it turned out that this is to test the waters for Squadron Supreme movie. What better victory lap could Marvel have then essentially doing a Justice League movie better than DC/WB?