I would realy like to see 2 things on this.
First to deal with a huge range of models I would like to see all models from here out be special forces. This would let you add options and not have to worry AS much about how every model in the game interacts. Basicly that gives book 1 and 2 as mostly core models for the given factions. Because you could only hire from one group of special forces at a time it would cut down some on model bloat.
Second I would like to see a year/qtr world wide story go on. They release a set of play rules that change up. Just for example
The road back.
As the masters return from the falling tower an assassin is hired from the Gov to pick one off. The next time you play a game with one of the masters who returned from the tower (need to provide offical list here -1 dead lady j) in a henchman organised tournamant. The winning faction gets a point. The faction with the most points gets a special new model or an updated model in the next update to represent the assassin. This could also be how players help to decide what gets a new nightmare version. They could also toss in other things for points to get more players involved art contest or some thing.