That's the Omega Legion Of Super-Heroes we see. Are these the Absolute versions of Lightning Lad, Colossal Boy, and Saturn Girl from the All-In Special invading the main DC Comics continuity already?

Darkseid's new Omega Legion, the dark opposite of the classic Legion of Super-Heroes team ... such as Brainiac 5, Ultra Boy, Mon-El, and even, at one point, Superman's son, Jon Kent.

Warning! Minor spoilers ahead for Summer of Superman Special #1!The Legion of Super-Heroes' dark variants created by Darkseid are about to return, and they're spelling doom for the entire DC Universe.