As far as I know, this is still on track. In original Japanese articles on Famistu and for the relase of Princess Maker 2, they say that the intent was to havie a joint collaboration between Gainax and CFK for releasing all 5 games on Steam. I was hoping Princess Maker 4 would come out next, but Princess Maker 5 is probably a better choice, at is very large, and good, and has elements of both a modern setting with fantasy elements.