From the announcement:
Sorry I’ve been really busy lately so there haven’t been many updates, so here’s something new for you guys: Campaign Rules!
These are for both Grimdark Future: Firefight and for Age of Fantasy: Skirmish and they allow you to play multi-game campaigns with 2 or more players. They feature rules for building a warband, stringing games together, gaining experience, etc.
Additionally there are optional rules for things such as new secret objectives, random battlefield conditions and crazy events that happen throughout the game.
Give them a try!