It appears that the rumors were correct about the Gangs of Commorragh, its a self contained game. It comes with two gangs, rules, and card scenery. Here is the latest
via Warhammer Community
https://www.warhammer-community.com/2017/01/02/gangs-of-commorragh-coming-soon/
Gangs of Commorragh allows you to recreate the violent skirmish battles for territorial supremacy that are waged constantly in the spires of the Dark City. Take charge of a feral gang of Hellion skyboarders, or a pack of lethal Reavers and carve out your empire in the webway’s last great city.
The box is an entirely self-contained game, giving you everything you need to play, including two gangs, rules and card scenery to recreate the jagged towers of Commorraggah’s forbidding skyline.
You can play quick one-off games, or a full campaign in which your gang will grow and develop as you win battles and claim more territory.
All in, Gangs of Commorragh is looking pretty exciting, and we’ll have more news about this new box game very soon.
Until then, watch the skies…*