I don't recall them promising cameos of all K1 party members. I recall them saying that some former party members would make cameos, and that seemed to have happened.
Also, Nur, you can't cite Bastila and Carth as false promises, since their part was exactly what the definition of a "cameo" is. Did you expect them to have Bastila and Carth take up the entire game? A cameo is a short appearance by a recognized character from a previous episode, and that's what those two got.