I think that right now we have pretty good set-up for Chamon/Aqshy duo progression with focus on Duardin of the mortal realms.
This can include new wave for KO,FS and CoS duardins plus Gholemkind release and moving towards Chaos duardins reveal and the begining of Hysh/Ulgu focus edition.
Just as example: Skaven starts their invasion in Chamon and Aqshy. Duardins suffer heavy loses but Gholemkind apears and saves the day. Duardins start to speak about reunification more openly. KO, FS and GK split. Vostarg, Thryng and some GK will lead new Khazalid Empire, where Lofnir, Nar and other GK will stay as it's own. Together united Duardin force with Grombrindal and SCE will defeat Skavens but at the moment of their triumph Chaos Duardins will show up and attacks. Then Grombrindal will fight Chaos Duardin leader and will be almost killed but Ulgu Aelves will show up and Malekith himself to save his old friend.(this will lead us to Ulgu/Hysh edition)
So we could get new wave for KO (New ship with New Brock centerpeace model where old model will became just generic Lord-Magnate), new wave for FS (Bael-Grimnir centerpeace model with 2 boxes of new models) and Grombrindal as new centerpeace model for united Duardin force(maybe with some hint for new Valaya base faction of duardins)