This is an all-new tale titled Star Wars: Inferno Squad, which was just announced on StarWars.com.
The synopsis teases that not everyone in Inferno Squad will be committed to the objective, as rising threats pose uncertainty.
This was most apparent late last year, when the book Catalyst came out and served as a direct prequel to the anthology movie Rogue One: A Star Wars Story.
No, Lucasfilm is not releasing a new novelization of A New Hope (which is the obvious follow-up to Rogue One).