I wonder if that would be the original Hellions, who might have survived Necrosha, or perhaps being resurrected again.
Or it might be the 3rd instalment with Hellion, Rockslide, Dust and the others.
Or, again a new formed villain team who are just using the Hellions name.
Since Emma is theRe and was always their teacher, it might be a team with the ones we seen in this art: Random, Lorelei , Corn, Polaris and some others.
Hope it is the second d one with Hellion.