Not gonna lie, I am also a bit disappointed that after so long, the update ignored all the other characters. I don't even play Casey's storyline (not a trap fan), but I do enjoy the story and content so far with the other characters.
So yeah, to install this update and see nothing for everyone else was a real bummer.
That being said, I am not subscribed to the dev, and therefore have no say in what they do. One thing I will not do is bash the dev like I've seen others do. It's their game; if you don't like it or what the dev is doing, don't play the game/support them and move on with your lives.
Simple.