Thanks for you comment. Six characters is currently planned and yes, they will be all introduced at Trishka's dinner. I wanted to introduce all characters early in the game so you can focus on a specific character storyline sooner.
Like I mention in this changelog, Trishka's dinner will open the door to add even more characters in the future, but right now, I'm limiting it to six.
All six characters will be available before the 0.1 release and from there, I will focus on one or two characters' storylines at each release.