Chris Claremont and Bill Sienkiewicz are reuniting for an all-new New Mutants one-shot, subtitled War Children. First reported by ScreenRant, the September one-shot will be a flashback story going back in Marvel history.
If you recall, Claremont and Sienkiewicz have a history of working together on both Uncanny X-Men and New Mutants, with their "Demon Bear Saga" storyline in particular influencing the upcoming New Mutants film.
Here is the solicitation for September 18's New Mutants: War Children #1. Look for Marvel's full September 2019 solicitations later this month on Newsarama.
NEW MUTANTS: WAR CHILDREN #1
Writer: Chris Claremont
Art: Bill Sienkiewicz
Cover: Bill Sienkiewicz
STRONG AND FREE! Don’t miss this momentous event as legendary creators CHRIS CLAREMONT and BILL SIENKIEWICZ reunite with Magik, Wolfsbane, Cannonball, Cypher, Mirage, Karma, and Sunspot to share this never before told story of the New Mutants’ past! When Warlock experiences a nightmare, he begins going haywire, and it’s up to his friends to save him! But as Warlock grows more frenzied, they should be worrying about being able to save themselves…and doubly so when Magik’s inner demon, Darkchylde, threatens to break free! Also, a special guest appearance by none other than Kitty Pryde!